WESTERN ALLIANCE BANCORPORATION $175,000,000 6.25% SUBORDINATED DEBENTURES DUE 2056 UNDERWRITING AGREEMENT

Exhibit 1.1

$175,000,000 6.25% SUBORDINATED DEBENTURES DUE 2056

June 9, 2016

To the Managers named in Schedule I hereto

for the Underwriters named in Schedule II hereto

Ladies and Gentlemen:

Western Alliance Bancorporation, a Delaware corporation (the “Company”), proposes to issue and sell to the several underwriters named in Schedule II hereto (the “Underwriters”), for whom you are acting as managers (the “Managers”), $175,000,000 aggregate principal amount of its 6.25% Subordinated Debentures due 2056 (the “Firm Securities”), and, at the option of the Managers acting on behalf of the Underwriters, up to an additional $25,000,000 aggregate principal amount of such 6.25% Subordinated Debentures due 2056 (the “Option Securities”), solely to cover over-allotments. The Firm Securities and the Option Securities are herein referred to collectively as the “Securities.” The Securities will be issued under the indenture specified in Schedule I hereto (the “Indenture”) between the Company and the Trustee identified in such Schedule (the “Trustee”). If the firm or firms listed in Schedule II hereto include only the Managers listed in Schedule I hereto, then the terms “Underwriters” and “Managers” as used herein shall each be deemed to refer to such firm or firms.

The Company has filed with the Securities and Exchange Commission (the “Commission”) a registration statement, including a prospectus, (the file number of which is set forth in Schedule I hereto) on Form S-3, relating to securities (the “Shelf Securities”), including the Securities, to be issued from time to time by the Company. The registration statement as amended to the date of this Agreement, including the information (if any) deemed to be part of the registration statement at the time of effectiveness pursuant to Rule 430A or Rule 430B under the Securities Act of 1933, as amended (the “Securities Act”), is hereinafter referred to as the “Registration Statement,” and the related prospectus covering the Shelf Securities dated May 7, 2015 in the form first used to confirm sales of the Securities (or in the form first made available to the Underwriters by the Company to meet requests of purchasers pursuant to Rule 173 under the Securities Act) is hereinafter referred to as the “Basic Prospectus.” The Basic Prospectus, as supplemented by the prospectus supplement specifically relating to the Securities in the form first used to confirm sales of the Securities (or in the form first made available to the Underwriters by the Company to meet requests of purchasers pursuant to Rule 173 under the Securities Act) is hereinafter referred to as the “Prospectus,” and the term “preliminary prospectus” means any preliminary form of the Prospectus. For purposes of this Agreement, “free writing prospectus” has the meaning set forth in Rule 405 under the Securities Act, “Time of Sale Prospectus” means the documents set forth opposite the caption “Time of Sale Prospectus” in Schedule I hereto, and “broadly available road show” means a “bona fide electronic road show” as defined in Rule 433(h)(5) under the Securities Act that has been made available without restriction to any person. As used herein, the terms “Registration Statement,” “Basic Prospectus,” “preliminary prospectus,” “Time of Sale Prospectus” and “Prospectus” shall include the documents, if any, incorporated by reference therein

on the date hereof. The terms “supplement,” “amendment,” and “amend” as used herein with respect to the Registration Statement, the Basic Prospectus, the Time of Sale Prospectus, any preliminary prospectus or the Prospectus shall include all documents subsequently filed by the Company with the Commission pursuant to the Securities Exchange Act of 1934, as amended (the “Exchange Act”), that are deemed to be incorporated by reference therein.

1. Representations and Warranties. The Company represents and warrants to and agrees with each of the Underwriters that:

(a) The Registration Statement has become effective; no stop order suspending the effectiveness of the Registration Statement is in effect, and no proceedings for such purpose are pending before or threatened by the Commission. If the Registration Statement is an automatic shelf registration statement as defined in Rule 405 under the Securities Act, the Company is a well-known seasoned issuer (as defined in Rule 405 under the Securities Act) eligible to use the Registration Statement as an automatic shelf registration statement and the Company has not received notice that the Commission objects to the use of the Registration Statement as an automatic shelf registration statement.

(b) (i) Each document filed or to be filed pursuant to the Exchange Act and incorporated by reference in the Time of Sale Prospectus or the Prospectus complied or will comply when so filed in all material respects with the Exchange Act and the applicable rules and regulations of the Commission thereunder, (ii) each part of the Registration Statement, when such part became effective, did not contain, and each such part, as amended or supplemented, if applicable, will not at the time of such amendment or supplement contain any untrue statement of a material fact or omit to state a material fact required to be stated therein or necessary to make the statements therein not misleading, (iii) the Registration Statement as of the date hereof does not contain any untrue statement of a material fact or omit to state a material fact required to be stated therein or necessary to make the statements therein not misleading, (iv) the Registration Statement and the Prospectus comply, and as amended or supplemented, if applicable, will comply in all material respects with the Securities Act and the applicable rules and regulations of the Commission thereunder, (v) the Time of Sale Prospectus does not, and at the time of each sale of the Securities in connection with the offering when the Prospectus is not yet available to prospective purchasers and at the Closing Date (as defined in Section 4), the Time of Sale Prospectus, as then amended or supplemented by the Company, if applicable, will not, contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements therein, in the light of the circumstances under which they were made, not misleading, (vi) each

broadly available road show, if any, when considered together with the Time of Sale Prospectus, does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements therein, in the light of the circumstances under which they were made, not misleading and (vii) the Prospectus does not contain and, as amended or supplemented, if applicable, will not at the time of such amendment or supplement contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements therein, in the light of the circumstances under which they were made, not misleading, except that the representations and warranties set forth in this paragraph do not apply to (A) statements or omissions in the Registration Statement, the Time of Sale Prospectus or the Prospectus based upon information relating to any Underwriter furnished to the Company in writing by such Underwriter through the Managers expressly for use therein or (B) that part of the Registration Statement that constitutes the Statement of Eligibility (Form T-1) under the Trust Indenture Act of 1939, as amended (the “Trust Indenture Act”), of the Trustee.

(c) The Company is not an “ineligible issuer” in connection with the offering pursuant to Rules 164, 405 and 433 under the Securities Act. Any free writing prospectus that the Company is required to file pursuant to Rule 433(d) under the Securities Act has been, or will be, filed with the Commission in accordance with the requirements of the Securities Act and the applicable rules and regulations of the Commission thereunder. Each free writing prospectus that the Company has filed, or is required to file, pursuant to Rule 433(d) under the Securities Act or that was prepared by or on behalf of or used or referred to by the Company complies or will comply in all material respects with the requirements of the Securities Act and the applicable rules and regulations of the Commission thereunder. Except for the free writing prospectuses, if any, identified in Schedule I hereto, and electronic road shows, if any, each furnished to you before first use, the Company has not prepared, used or referred to, and will not, without your prior consent, prepare, use or refer to, any free writing prospectus.

(d) Neither the Company nor any of its subsidiaries has sustained since the date of the latest audited financial statements included or incorporated by reference in the Time of Sale Prospectus any material loss or interference with its business from fire, explosion, flood or other calamity, whether or not covered by insurance, or from any labor dispute or court or governmental action, order or decree, otherwise than as set forth or contemplated in the Time of Sale Prospectus; and, since the respective dates as of which information is given in the Registration Statement and the Time of Sale Prospectus, there has not been (i) any change in the capital stock or long term debt of the Company or any of its subsidiaries or any material adverse

change, or any development involving a prospective material adverse change, in or affecting the general affairs, management, financial position, condition (financial or otherwise), stockholders’ equity or results of operations of the Company and its subsidiaries taken as a whole, whether or not arising in the ordinary course of business (a “Material Adverse Effect”), otherwise than as set forth or contemplated in the Time of Sale Prospectus; (ii) there have been no transactions entered into by the Company or any of its subsidiaries, other than those in the ordinary course of business or as set forth or contemplated in the Time of Sale Prospectus and the Prospectus, which are material with respect to the Company and its subsidiaries taken as a whole; and (iii) there has been no dividend or distribution of any kind declared, paid or made by the Company on any class of its capital stock;

(e) The Company and its subsidiaries have good and marketable title to all real property and good and marketable title to all personal property owned by them, in each case free and clear of all liens, mortgages, pledges, security interests, encumbrances and defects except such as are described in the Time of Sale Prospectus and the Prospectus or such as do not, individually or in the aggregate, materially affect the value of such property and do not interfere with the use made and proposed to be made of such property by the Company and its subsidiaries taken as a whole; and all of the leases and subleases material to the business of the Company and its subsidiaries, considered as one enterprise, and under which the Company or any of its subsidiaries holds properties described in the Time of Sale Prospectus and the Prospectus, are in full force and effect, and neither the Company nor any subsidiary has any notice of any material claim of any sort that has been asserted by anyone adverse to the rights of the Company or any subsidiary under any of the leases or subleases mentioned above, or affecting or questioning the rights of the Company or such subsidiary to the continued possession of the leased or subleased premises under any such lease or sublease;

(f) The Company has been duly incorporated and is validly existing as a corporation in good standing under the laws of the State of Delaware, with power and authority to own, lease and operate its properties and conduct its business as described in the Time of Sale Prospectus and the Prospectus and perform its obligations under this Agreement, the Indenture and the Securities, and has been duly qualified as a foreign corporation for the transaction of business and is in good standing under the laws of each other jurisdiction in which it owns or leases properties or conducts any business so as to require such qualification, or is subject to no material liability or disability by reason of the failure to be so qualified in any such jurisdiction, except where the failure so to qualify or to be in good standing would not, individually or in the aggregate, reasonably be expected to have a

Material Adverse Effect; each “significant subsidiary” of the Company (as such term is defined in Rule 1-02 of Regulation S-X) (each a “Subsidiary” and, collectively, the “Subsidiaries”) has been duly organized and is validly existing as a corporation in good standing under the laws of the jurisdiction of its incorporation (or in the case of the Subsidiary which is a bank (the “Bank”), has been duly chartered and holds the requisite authority from its chartering state bank regulatory authority to do business as a state-chartered bank under the laws of its chartering jurisdiction), has corporate power and authority to own, lease and operate its properties and to conduct its business as described in the Time of Sale Prospectus and the Prospectus and is duly qualified as a foreign corporation to transact business and is in good standing in each jurisdiction in which such qualification is required, whether by reason of the ownership or leasing of property or the conduct of business, except where the failure so to qualify or to be in good standing would not result in a Material Adverse Effect; the activities of the Company’s subsidiaries are permitted of subsidiaries of a bank holding company under applicable law and the rules and regulations of the Federal Reserve Board (the “Federal Reserve”) set forth in Title 12 of the Code of Federal Regulations; the activities of the Bank are permitted under the laws and regulations of its jurisdiction of organization and the deposit accounts in the Bank are insured up to the applicable limits by the Federal Deposit Insurance Corporation (the “FDIC”); except as otherwise disclosed in the Registration Statement, all of the issued and outstanding capital stock of each such Subsidiary has been duly authorized and validly issued, is fully paid and non-assessable and is owned by the Company, directly or through subsidiaries, free and clear of any security interest, mortgage, pledge, lien, encumbrance, claim or equity; none of the outstanding shares of capital stock of any Subsidiary was issued in violation of the preemptive or similar rights of any security holder of such Subsidiary;

(g) All of the issued shares of capital stock of each subsidiary of the Company have been duly and validly authorized and issued, are fully paid and non-assessable and are owned directly or indirectly by the Company, free and clear of all liens, encumbrances, equities or claims; none of the outstanding shares of capital stock of any subsidiary was issued in violation of the preemptive or similar rights of any securityholder of such subsidiary; except as described in the Time of Sale Prospectus and the Prospectus, there are no outstanding rights (contractual or otherwise), warrants or options to acquire, or instruments convertible into or exchangeable for, or agreements or understandings with respect to the sale or issuance of, any shares of capital stock of or other equity interest in the Company except pursuant to the Company’s stock plans and awards currently in effect on the date hereof;

(h) This Agreement has been duly authorized, executed and delivered by the Company.

(i) The Indenture has been duly qualified under the Trust Indenture Act and has been duly authorized, and when executed and delivered by each of the parties thereto, will constitute a valid and binding agreement of, the Company, enforceable in accordance with its terms, subject to applicable bankruptcy, insolvency and similar laws affecting creditors’ rights generally and equitable principles of general applicability.

(j) The Securities have been duly authorized and, when executed and authenticated in accordance with the provisions of the Indenture and delivered to and paid for by the Underwriters in accordance with the terms of this Agreement, will be valid and binding obligations of the Company, enforceable in accordance with their respective terms, subject to applicable bankruptcy, insolvency and similar laws affecting creditors’ rights generally and equitable principles of general applicability, and will be entitled to the benefits of the Indenture.

(k) The execution, delivery and performance of this Agreement, the Indenture and the Securities and the compliance by the Company with all of the provisions this Agreement, the Indenture and the Securities and the consummation of the other transactions contemplated herein and therein (including the use of the proceeds from the sale of the Securities as described in the Prospectus under the caption “Use of Proceeds”) do not and will not, whether with or without the giving of notice or passage of time or both, conflict with or result in a breach or violation of any of the terms or provisions of, or constitute a default or Repayment Event under, any indenture, mortgage, deed of trust, loan agreement or other agreement or instrument to which the Company or any of its subsidiaries is a party or by which the Company or any of its subsidiaries is bound or to which any of the property or assets of the Company or any of its subsidiaries is subject, except for such conflicts, violations or defaults that would not, individually or in the aggregate, reasonably be expected to result in a Material Adverse Effect, nor will such action result in any violation of the provisions of the Amended and Restated Articles of Incorporation, as amended, or Amended and Restated By-Laws of the Company or the charter or bylaws of any subsidiary or any statute or any order, rule or regulation of any court or governmental agency or body having jurisdiction over the Company or any of its subsidiaries or any of their properties; and no consent, approval, authorization, order, registration or qualification of or with any such court or governmental agency or body is required for the issue and sale of the Securities or the consummation by the Company of the transactions contemplated by this Agreement, the Indenture and the

Securities except as have been obtained from the Federal Reserve Bank of San Francisco or any other relevant governmental agency or body and under the Securities Act, and except such consents, approvals, authorizations, registrations or qualifications as may be required under state securities or Blue Sky laws in connection with the purchase and distribution of the Securities by the Managers; as used herein, a “Repayment Event” means any event or condition which gives the holder of any note, debenture or other evidence of indebtedness (or any person acting on such holder’s behalf) the right to require the repurchase, redemption or repayment of all or a portion of such indebtedness by the Company or any subsidiary;

(l) Other than as set forth in the Time of Sale Prospectus and the Prospectus, there are no legal or governmental proceedings pending to which the Company or any of its subsidiaries is a party or of which any property of the Company or any of its subsidiaries is the subject, which, (i) is required to be disclosed in the Registration Statement (other than as disclosed therein) or (ii) if determined adversely to the Company or any of its subsidiaries, would, individually or in the aggregate, reasonably be expected to have a Material Adverse Effect or which might reasonably be expected to materially and adversely affect the properties or assets thereof or the consummation of the transactions contemplated in this Agreement, the Indenture and the Securities, or the performance by the Company of its obligations hereunder and thereunder; and, to the best of the Company’s knowledge, no such proceedings are threatened or contemplated by governmental authorities or threatened by others;

(m) Neither the Company nor any of its subsidiaries is in violation of its Amended and Restated Articles of Incorporation, as amended, or Amended and Restated By-Laws or in default in the performance or observance of any obligation, covenant or condition contained in any indenture, mortgage, deed of trust, loan agreement, lease or other agreement or instrument to which it is a party or by which it or any of its properties may be bound, except, in the case of any indenture, mortgage, deed of trust, loan agreement, lease or other agreement or instrument, for such defaults that would not, individually or in the aggregate, reasonably be expected to result in a Material Adverse Effect;

(n) The statements set forth in the Time of Sale Prospectus and the Prospectus under the caption “Description of Debentures”, insofar as they purport to constitute a summary of the terms of the Securities and under the caption “Material United States Federal Income Considerations” insofar as they purport to describe the provisions of the laws and documents referred to therein, are accurate, complete and fair;

(o) The Company is not and, after giving effect to the offering and sale of the Securities and the application of the proceeds thereof, will not be an “investment company”, or an entity “controlled” by an “investment company” as such term is defined in the Investment Company Act of 1940, as amended;

(p) RSM US LLP, who has certified certain financial statements of the Company and its subsidiaries and who has audited the Company’s internal control over financial reporting and management’s assessment thereof, is an independent registered public accounting firm as required by the Securities Act and the rules and regulations of the Commission thereunder; with respect to the Company, RSM US LLP is not and has not been in violation of the auditor independence requirements of the ▇▇▇▇▇▇▇▇-▇▇▇▇▇ Act of 2002 (“▇▇▇▇▇▇▇▇-▇▇▇▇▇ Act”) and the related rules and regulations of the Commission;

(q) The Company and each of its Subsidiaries maintains a system of internal control over financial reporting (as such term is defined in Rule 13a-15(f) under the Exchange Act) that complies with the requirements of the Exchange Act and has been designed by the Company’s principal executive officer and principal financial officer, or under their supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles. The Company’s internal control over financial reporting is effective and the Company is not aware of any material weaknesses in its internal control over financial reporting (whether or not remediated);

(r) Since the date of the latest audited financial statements included or incorporated by reference in the Prospectus, there has been no change in the Company’s internal control over financial reporting that has materially affected, or is reasonably likely to materially affect, the Company’s internal control over financial reporting;

(s) The Company and its Subsidiaries maintain disclosure controls and procedures (as such term is defined in Rule 13a-15(e) under the Exchange Act) that comply with the requirements of the Exchange Act; such disclosure controls and procedures have been designed to ensure that material information relating to the Company and its subsidiaries is made known to the Company’s principal executive officer and principal financial officer by others within those entities to allow timely decisions regarding disclosure; and such disclosure controls and procedures are effective to perform the functions for which they were established. Based on the evaluation of the Company’s and each Subsidiary’s disclosure controls and procedures described above, the Company is not aware of (1) any significant

deficiency in the design or operation of internal controls which could adversely affect the Company’s ability to record, process, summarize and report financial data or any material weaknesses in internal controls or (2) any fraud, whether or not material, that involves management or other employees who have a significant role in the Company’s internal controls. Since the most recent evaluation of the Company’s disclosure controls and procedures described above, there have been no significant changes in internal controls or in other factors that could significantly affect internal controls;

(t) The financial statements included in the Registration Statement, the Time of Sale Prospectus and the Prospectus, together with the related schedules and notes, fairly present the financial position of the Company and its consolidated subsidiaries at the dates indicated and the statement of operations, stockholders’ equity and cash flows of the Company and its consolidated subsidiaries for the periods specified; said financial statements have been prepared in conformity with generally accepted accounting principles (“GAAP”) applied on a consistent basis throughout the periods involved. The supporting schedules, if any, included in the Registration Statement, the Time of Sale Prospectus and the Prospectus present fairly in accordance with GAAP the information required to be stated therein. The selected financial data and the summary financial information included in the Registration Statement, the Time of Sale Prospectus and the Prospectus present fairly the information shown therein and have been compiled on a basis consistent with that of the audited financial statements included in the Registration Statement and the books and records of the Company. No other financial statements or schedules are required to be included in the Registration Statement. To the extent applicable, all disclosures contained in the Registration Statement or the Prospectus regarding “non-GAAP financial measures” (as such term is defined by the rules and regulations of the Commission) comply with Regulation G of the Exchange Act, the rules and regulations of the Exchange Act and Item 10 of Regulation S-K under the Securities Act, as applicable;

(u) No labor dispute with the employees of the Company or any of its subsidiaries exists or, to the knowledge of the Company, is imminent, and the Company is not aware of any existing or imminent labor disturbance by the employees of any of its or any subsidiary’s principal suppliers, manufacturers, customers or contractors, which, in either case, may reasonably be expected to result in a Material Adverse Effect;

(v) There are no contracts or documents which are required to be described in the Registration Statement, the Time of Sale Prospectus, the Prospectus or the documents incorporated by reference therein or to be filed as exhibits thereto which have not been so described and filed as required;

(w) The Company and its subsidiaries own or possess, or can acquire on reasonable terms, adequate patents, patent rights, licenses, inventions, copyrights, know-how (including trade secrets and other unpatented and/or unpatentable proprietary or confidential information, systems or procedures and excluding generally commercially available “off the shelf” software programs licensed pursuant to shrink wrap or “click and accept” licenses), trademarks, service marks, trade names or other intellectual property (collectively, “Intellectual Property”) necessary to carry on the business now operated by them, and neither the Company nor any of its subsidiaries has received any notice or is otherwise aware of any infringement of or conflict with asserted rights of others with respect to any Intellectual Property or of any facts or circumstances which would render any Intellectual Property invalid or inadequate to protect the interest of the Company or any of its subsidiaries therein, and which infringement or conflict (if the subject of any unfavorable decision, ruling or finding) or invalidity or inadequacy, individually or in the aggregate, would reasonably be expected to result in a Material Adverse Effect;

(x) The Company and its subsidiaries possess such permits, licenses, approvals, consents and other authorizations (collectively, “Governmental Licenses”) issued by the appropriate federal, state, local or foreign regulatory agencies or bodies necessary to conduct the business now operated by them; the Company and its subsidiaries are in compliance with the terms and conditions of all such Governmental Licenses, except where the failure so to comply would not, individually or in the aggregate, reasonably be expected to have a Material Adverse Effect; all of the Governmental Licenses are valid and in full force and effect, except where the invalidity of such Governmental Licenses or the failure of such Governmental Licenses to be in full force and effect would not, individually or in the aggregate, reasonably be expected to have a Material Adverse Effect; and neither the Company nor any of its subsidiaries has received any notice of proceedings relating to the revocation or modification of any such Governmental Licenses which, individually or in the aggregate, if the subject of an unfavorable decision, ruling or finding, would reasonably be expected to result in a Material Adverse Effect. Neither the Company nor any of its subsidiaries has failed to file with applicable regulatory authorities any statement, report, information or form required by any applicable law, regulation or order, except where the failure to be so in compliance would not, individually or in the aggregate, reasonably be expected to have a Material Adverse Effect, all such filings were in material compliance with applicable laws when filed and no material deficiencies have been asserted by any regulatory commission, agency or authority with respect to any such filings or submissions;

(y) Except as described in the Registration Statement, the Time of Sale Prospectus and the Prospectus, and except as would not, individually or in the aggregate, reasonably be expected to result in a Material Adverse Effect, (A) neither the Company nor any of its subsidiaries is in violation of any federal, state, local or foreign statute, law, rule, regulation, ordinance, code, policy or rule of common law or any judicial or administrative interpretation thereof, including any judicial or administrative order, consent, decree or judgment, relating to pollution or protection of human health, the environment (including, without limitation, ambient air, surface water, groundwater, land surface or subsurface strata) or wildlife, including, without limitation, laws and regulations relating to the release or threatened release of chemicals, pollutants, contaminants, wastes, toxic substances, hazardous substances, petroleum or petroleum products, asbestos-containing materials or mold (collectively, “Hazardous Materials”) or to the manufacture, processing, distribution, use, treatment, storage, disposal, transport or handling of Hazardous Materials (collectively, “Environmental Laws”), (B) the Company and its subsidiaries have all permits, authorizations and approvals required under any applicable Environmental Laws and are each in compliance with their requirements, (C) there are no pending or threatened administrative, regulatory or judicial actions, suits, demands, demand letters, claims, liens, notices of noncompliance or violation, investigation or proceedings relating to any Environmental Law against the Company or any of its subsidiaries and (D) there are no events or circumstances that might reasonably be expected to form the basis of an order for clean-up or remediation, or an action, suit or proceeding by any private party or governmental body or agency, against or affecting the Company or any of its subsidiaries relating to Hazardous Materials or any Environmental Laws;

(z) The Company and each of its subsidiaries has (i) timely filed all material foreign, United States federal, state and local tax returns, information returns, and similar reports that are required to be filed (taking into account valid extensions), and all tax returns are true, correct and complete, (ii) paid in full all taxes required to be paid by it and any other assessment, fine or penalty levied against it, except for any such tax assessment, fine or penalty that is currently being contested in good faith or as would not, individually or in the aggregate, reasonably be expected to have a Material Adverse Effect, and (iii) established on the most recent balance sheet reserves that are adequate for the payment of all taxes not yet due and payable;

(aa) The Company and its subsidiaries carry, or are covered by, insurance in such amounts and covering such risks as the Company reasonably believes are adequate for the conduct of the business of the Company and its subsidiaries and the value of their properties and as are customary in the business in which the Company and its subsidiaries are engaged; neither the Company nor any of its subsidiaries has been refused any insurance coverage sought or applied for; and the Company has no reason to believe that they will not be able to renew their existing insurance coverage as and when such coverage expires or to obtain similar coverage from similar insurers as may be necessary to continue its business at a cost that would not reasonably be expected to have a Material Adverse Effect;

(bb) The statistical and market related data contained in the Time of Sale Prospectus and the Prospectus are based on or derived from sources which the Company believes are reliable and accurate;

(cc) No relationship, direct or indirect, exists between or among the Company or any of its subsidiaries, on the one hand, and the directors, officers, stockholders, customers or suppliers of the Company or any of its subsidiaries, on the other, that is required by the Securities Act or by the rules and regulations of the Commission thereunder to be described in the Registration Statement, the Time of Sale Prospectus and/or the Prospectus and that is not so described;

(dd) There is and has been no failure on the part of the Company or any of its directors or officers, in their capacities as such, to comply in all material respects with any provision of the ▇▇▇▇▇▇▇▇-▇▇▇▇▇ Act and the rules and regulations promulgated in connection therewith, including Section 402 related to loans and Sections 302 and 906 related to certifications;

(ee) (i) None of the Company or its subsidiaries or affiliates, or any director, officer, or employee thereof, or, to the Company’s knowledge, any agent or representative of the Company or of any of its subsidiaries or affiliates, has taken or will take any action in furtherance of an offer, payment, promise to pay, or authorization or approval of the payment, giving or receipt of money, property, gifts or anything else of value, directly or indirectly, to any government official (including any officer or employee of a government or government-owned or controlled entity or of a public international organization, or any person acting in an official capacity for or on behalf of any of the foregoing, or any political party or party official or candidate for political office) (“Government Official”) in order to influence official action, or to any person in violation of any applicable anti-corruption laws; (ii) the Company and its subsidiaries and affiliates have conducted their businesses in compliance with applicable anti-corruption laws and have

instituted and maintained and will continue to maintain policies and procedures reasonably designed to promote and achieve compliance with such laws and with the representations and warranties contained herein; and (iii) neither the Company nor its subsidiaries will use, directly or indirectly, the proceeds of the offering in furtherance of an offer, payment, promise to pay, or authorization of the payment or giving of money, or anything else of value, to any person in violation of any applicable anti-corruption laws.

(ff) No person has the right to require the Company or any of its subsidiaries to register any securities for sale under the Securities Act by reason of the filing of the Registration Statement with the Commission or the issuance and sale of the Securities to be sold by the Company hereunder;

(gg) No forward-looking statement (within the meaning of Section 27A of the Securities Act and Section 21E of the Exchange Act) contained in the Registration Statement, the Time of Sale prospectus and the Prospectus has been made or reaffirmed without a reasonable basis or has been disclosed other than in good faith;

(hh) Other than as contemplated by this Agreement, there is no broker, finder or other party that is entitled to receive from the Company or any subsidiary any brokerage or finder’s fee or any other fee, commission or payment as a result of the transactions contemplated by this Agreement;

(ii) The Company and each of the subsidiaries or their “ERISA Affiliates” (as defined below) are in compliance in all material respects with all presently applicable provisions of the Employee Retirement Income Security Act of 1974, as amended, including the regulations and published interpretations thereunder (“ERISA”); no “reportable event” (as defined in ERISA) has occurred with respect to any “employee benefit plan” (as defined in ERISA) for which the Company or any of the subsidiaries or ERISA Affiliates would have any liability; the Company and each of the subsidiaries or their ERISA Affiliates have not incurred and do not expect to incur liability under (i) Title IV of ERISA with respect to termination of, or withdrawal from, any “employee benefit plan” or (ii) Sections 412, 4971, 4975 or 4980B of the United States Internal Revenue Code of 1986, as amended, and the regulations and published interpretations thereunder (collectively the “Code”); and each “employee benefit plan” for which the Company and each of its subsidiaries or any of their ERISA Affiliates would have any liability that is intended to be qualified under Section 401(a) of the Code is so qualified in all material respects and nothing as occurred, whether by action or by failure to act, which would cause the loss of such qualification. “ERISA Affiliate” means, with respect to the Company or a subsidiary, any member of any group of organizations described in Sections 414(b), (c), (m) or (o) of the Code or Section 400(b) of ERISA of which the Company or such subsidiary is a member;

(jj) Each of the Company and its subsidiaries has good and marketable title to all securities held by it (except securities sold under repurchase agreements or held in any fiduciary or agency capacity) free and clear of any lien, claim, charge, option, encumbrance, mortgage, pledge or security interest or other restriction of any kind, except to the extent such securities are pledged in the ordinary course of business consistent with prudent business practices to secure obligations of the Company or any of its subsidiaries and except for such defects in title or liens, claims, charges, options, encumbrances, mortgages, pledges or security interests or other restrictions of any kind that would not be material to the Company and its subsidiaries taken as a whole. Such securities are valued on the books of the Company and its subsidiaries in accordance with GAAP;

(kk) Any and all material swaps, caps, floors, futures, forward contracts, option agreements (other than employee stock options) and other derivative financial instruments, contracts or arrangements, whether entered into for the account of the Company or one of its subsidiaries or for the account of a customer of the Company or one of its subsidiaries, were entered into in the ordinary course of business and in accordance with applicable laws, rules, regulations and policies of all applicable regulatory agencies and with counterparties believed to be financially responsible at the time. The Company and each of its subsidiaries have duly performed in all material respects all of their obligations thereunder to the extent that such obligations to perform have accrued, and there are no breaches, violations or defaults or allegations or assertions of such by any party thereunder;

(ll) BW Real Estate, Inc. is organized and carries on its business so as to enable it to qualify as a “real estate investment trust” (a “REIT”) under Sections 856 through 860 of the Code, and no transaction or other event has occurred or is expected to occur that would be reasonably likely to cause BW Real Estate, Inc. to not qualify as a REIT for its current taxable year or for future taxable years;

(mm) The Company is a registered bank holding company under the Bank Holding Company Act of 1956, as amended. Each of the Company and its subsidiaries is in compliance in all material respects with all laws administered by, and all rules and regulations of the Federal Reserve, the FDIC, and the Arizona Department of Financial Institutions, as applicable, and any other federal or state bank regulatory authority with jurisdiction over the Company or any subsidiary (collectively, “Bank Regulatory Authorities”), except as disclosed in

the Time of Sale Prospectus and the Prospectus; and, except as disclosed in the Time of Sale Prospectus and the Prospectus, neither the Company nor the Bank is a party to any written agreement or memorandum of understanding, whether public or confidential, with, or a party to any commitment letter or similar undertaking to, or is subject to any order or directive by, or is a recipient of any extraordinary supervisory letter from, or has adopted any board of director resolutions at the request of, any Bank Regulatory Authority, nor have any of them been advised by any Bank Regulatory Authority that it is contemplating issuing or requesting (or is considering the appropriateness of issuing or requesting) any such order, decree, agreement, memorandum of understanding, extraordinary supervisory letter, commitment letter or similar submission, whether public or confidential, or any material board of director resolutions; the deposit accounts of the Bank are insured up to the applicable limits by the FDIC;

(nn) Except as disclosed in the Time of Sale Prospectus and the Prospectus, the Company and its subsidiaries conduct their respective businesses in compliance in all material respects with all federal, state, local and foreign statutes, laws, rules, regulations, decisions, directives and orders applicable to them (including, without limitation, all applicable regulations and orders of, the Equal Credit Opportunity Act, the Fair Housing Act, the Community Reinvestment Act, the Home Mortgage Disclosure Act, all other applicable fair lending laws or other laws relating to discrimination, the Bank Secrecy Act, Title III of the USA Patriot Act, the rules and regulations thereunder and any related or similar rules, regulations or guidelines, issued, administered or enforced by any governmental agency);

(oo) Except as disclosed in the Time of Sale Prospectus and the Prospectus, the Bank is not currently prohibited, directly or indirectly, from (i) paying any dividends to the Company without prior approval, which payment would otherwise be payable under federal or state banking laws or regulations, (ii) making any other distribution on the Bank’s capital stock, (iii) repaying to the Company any loans or advances to the Bank from the Company or (iv) transferring any of the Bank’s property or assets to the Company or any other subsidiary of the Company;

(pp) The operations of the Company and its subsidiaries are and have been conducted at all times in material compliance with all applicable financial recordkeeping and reporting requirements, including those of the Bank Secrecy Act, as amended by Title III of the Uniting and Strengthening America by Providing Appropriate Tools Required to Intercept and Obstruct Terrorism Act of 2001 (USA PATRIOT Act), and the applicable anti-money laundering statutes of jurisdictions where the Company and its subsidiaries conduct business,

the rules and regulations thereunder and any related or similar rules, regulations or guidelines, issued, administered or enforced by any governmental agency (collectively, the “Anti-Money Laundering Laws”), and no action, suit or proceeding by or before any court or governmental agency, authority or body or any arbitrator involving the Company or any of its subsidiaries with respect to the Anti-Money Laundering Laws is pending or, to the knowledge of the Company, threatened.

(qq) (i) None of the Company, any of its subsidiaries, or any director, officer, or employee thereof, or, to the Company’s knowledge, any agent, affiliate or representative of the Company or any of its subsidiaries, is an individual or entity (“Person”) that is, or is owned or controlled by one or more Persons that are:

(A) the subject of any sanctions administered or enforced by the U.S. Department of Treasury’s Office of Foreign Assets Control (“OFAC”) (collectively, “Sanctions”), or

(B) located, organized or resident in a country or territory that is the subject of Sanctions (including, without limitation, Crimea, Cuba, Iran, North Korea, Sudan and Syria).

(ii) The Company will not, directly or indirectly, use the proceeds of the offering, or lend, contribute or otherwise make available such proceeds to any subsidiary, joint venture partner or other Person:

(A) to fund or facilitate any activities or business of or with any Person or in any country or territory that, at the time of such funding or facilitation, is the subject of Sanctions; or

(B) in any other manner that will result in a violation of Sanctions by any Person (including any Person participating in the offering, whether as underwriter, advisor, investor or otherwise).

(rr) Neither the Company nor any of its Subsidiaries, nor any affiliates of the Company or its Subsidiaries, has taken, directly or indirectly, any action designed to or that could reasonably be expected to cause or result in any stabilization or manipulation of the price of the Securities; and

(ss) The Company has not distributed and, prior to the completion of the public offer and sale of the Securities, will not distribute any prospectus (as such term is defined in the Securities Act and the rules and regulations thereunder) in connection with the offering and sale of the Securities other than the Registration Statement, the Time of Sale Prospectus, the Prospectus or other materials, if any, permitted by the Securities Act or by the rules and regulations thereunder and approved by the Managers.

2. Agreements to Sell and Purchase. The Company hereby agrees to sell to the several Underwriters, and each Underwriter, upon the basis of the representations and warranties herein contained, but subject to the conditions hereinafter stated, agrees, severally and not jointly, to purchase from the Company the respective principal amounts of Securities set forth in Schedule II hereto opposite its name at the purchase price set forth in Schedule I hereto. Upon the basis of the representations and warranties herein contained, but subject to the conditions hereinafter stated, the Company agrees to sell to the Underwriters the Option Securities, and the Underwriters shall have the right to purchase, severally and not jointly, up to the number of Option Securities set forth in Schedule I hereto at the Purchase Price; provided, however, that the amount paid by the Underwriters for any Option Securities shall be reduced by an amount per share equal to any interest payments, if any, payable on the Firm Securities but not payable on the Option Securities. You may exercise this right on behalf of the Underwriters, in whole or in part, once only by giving written notice not later than 30 days after the date of the Prospectus. Any exercise notice shall specify the number of Option Securities to be purchased by the Underwriters and the date on which such Securities are to be purchased. The purchase date must be at least one business day after the written notice is given and may not be earlier than the closing date for the Firm Securities nor later than ten business days after the date of such notice. Option Securities may be purchased as provided in Section 4 hereof solely for the purpose of covering over-allotments made in connection with the offering of the Firm Securities. On the day, if any, that Option Securities are to be purchased (the “Option Closing Date”), each Underwriter agrees, severally and not jointly, to purchase the number of Option Securities (subject to such adjustments to eliminate notes below the authorized denominations as you may determine) that bears the same proportion to the total number of Option Securities to be purchased on such Option Closing Date as the number of Firm Securities set forth in Schedule II hereto opposite the name of such Underwriter bears to the total number of Firm Securities.

3. Public Offering. The Company is advised by you that the Underwriters propose to make a public offering of their respective portions of the Securities as soon after the Registration Statement and this Agreement have become effective as in your judgment is advisable. The Company is further advised by you that the Securities are to be offered to the public upon the terms set forth in the Prospectus.

4. Payment and Delivery. Payment for the Firm Securities shall be made to the Company in Federal or other funds immediately available in New York City on the closing date and time set forth in Schedule I hereto, or at such other time on the same or such other date, not later than the fifth business day thereafter, as may be designated in writing by you. The time and date of such payment are hereinafter referred to as the “Closing Date.” The Closing Date and the Option Closing Date are each sometimes referred to herein as an “Applicable Closing Date.”

Payment for any Option Securities shall be made to the Company in Federal or other funds immediately available in New York City on the date specified in the corresponding notice described in Section 2 or at such other time or on the same or on such other date, in any event not later than the tenth business day thereafter, as may be designated in writing by you.

Payment for the Securities shall be made against delivery to you on the Applicable Closing Date for the respective accounts of the several Underwriters of the Securities registered in such names and in such denominations as you shall request in writing not later than one full business day prior to the Applicable Closing Date, with any transfer taxes payable in connection with the transfer of the Securities to the Underwriters duly paid.

5. Conditions to the Underwriters’ Obligations. The several obligations of the Underwriters are subject to the following conditions:

(a) Subsequent to the execution and delivery of this Agreement and prior to the Applicable Closing Date:

(i) there shall not have occurred any downgrading, nor shall any notice have been given of any intended or potential downgrading or of any review for a possible change that does not indicate the direction of the possible change, in the rating accorded the Company or any of the securities of the Company or any of its subsidiaries or in the rating outlook for the Company by any “nationally recognized statistical rating organization,” as such term is defined in Section 3(a)(62) of the Exchange Act; and

(ii) there shall not have occurred any change, or any development involving a prospective change, in the condition, financial or otherwise, or in the earnings, business or operations of the Company and its subsidiaries, taken as a whole, from that set forth in the Time of Sale Prospectus that, in your judgment, is material and adverse and that makes it, in your judgment, impracticable to market the Securities on the terms and in the manner contemplated in the Time of Sale Prospectus.

(b) The Underwriters shall have received on the Applicable Closing Date a certificate, dated such Applicable Closing Date and signed by an executive officer of the Company, to the effect set forth in Section 5(a)(i) above and to the effect that the representations and warranties of the Company contained in this Agreement are true and correct as of the Applicable Closing Date and that the Company has complied with all of the agreements and satisfied all of the conditions on its part to be performed or satisfied hereunder on or before the Applicable Closing Date.

The officer signing and delivering such certificate may rely upon his or her knowledge as to proceedings threatened.

(c) The Underwriters shall have received on the Applicable Closing Date an opinion of ▇▇▇▇▇ Lovells US LLP, outside counsel for the Company, dated such Applicable Closing Date, to the effect that:

(i) The Company is validly existing as a corporation and in good standing as of the date of the good standing certificate under the laws of the State of Delaware;

(ii) The Company has the corporate power to execute, deliver and perform its obligations under the Indenture and this Agreement and to own, lease and operate its current properties and to conduct its business as described in the Prospectus;

(iii) This Agreement has been duly authorized, executed and delivered by the Company;

(iv) The Indenture (i) has been duly qualified under the Trust Indenture Act, (ii) has been duly authorized, executed and delivered on behalf of the Company, and (iii) constitutes a valid and binding obligation of the Company enforceable against the Company in accordance with its terms, subject to the effect of (1) bankruptcy, insolvency, reorganization, receivership, moratorium and other laws affecting creditors’ rights (including, without limitation, the effect of statutory and other law regarding fraudulent conveyances, fraudulent transfers and preferential transfers); and (2) the exercise of judicial discretion and the application of principles of equity, good faith, fair dealing, reasonableness, conscionability and materiality (regardless of whether the applicable agreements are considered in a proceeding in equity or at law);

(v) (i) The Debentures have been duly authorized by the Company; and (ii) the Debentures have been duly executed, issued and delivered by the Company and, when authenticated by the Trustee in the manner provided for in the Indenture, against payment therefor in accordance with this Agreement, will constitute valid and binding obligations of the Company entitled to the benefits of the Indenture and enforceable against the Company in accordance with their terms, subject to the effect of (1) bankruptcy, insolvency, reorganization, receivership, moratorium and other laws affecting creditors’ rights (including, without limitation, the effect of statutory and other law regarding fraudulent conveyances, fraudulent transfers and preferential transfers); and (2) the exercise of judicial discretion and the application of principles of equity, good faith, fair dealing, reasonableness, conscionability and materiality (regardless of whether the applicable agreements are considered in a proceeding in equity or at law);

(vi) The execution, delivery and consummation on the date hereof by the Company of this Agreement do not (i) violate the certificate of incorporation or bylaws of the Company, (ii) violate any provision of applicable federal law, the laws of New York or the Delaware General Corporation Law (the “DGCL”), (iii) breach or constitute a default under any of the contracts to which the Company is a party that is filed as an exhibit to the Company’s (a) Annual Report on Form 10-K for the fiscal year ended December 31, 2015 and (b) Quarterly Report on Form 10-Q for the quarterly period ended March 31, 2016 (except that we express no opinion with respect to any matters that would require a mathematical calculation or a financial or accounting determination);

(vii) No approval or consent of, or registration or filing with, (i) any federal governmental agency or any New York governmental agency is required to be obtained or made by the Company under applicable federal or New York law or (ii) any Delaware governmental agency under the DGCL in connection with the execution, delivery and consummation on the date hereof by the Company of this Agreement;

(viii) The Debentures and the Indenture conform as to legal matters in all material respects to the descriptions thereof set forth in the Registration Statement, the Time of Sale Prospectus and the Prospectus under the captions “Description of Debt Securities” and “Description of Debentures”;

(ix) The information in the Registration Statement, the Time of Sale Prospectus and the Prospectus under the captions “Description of Debt Securities” and “Description of Debentures” and the information incorporated by reference in those sections, to the extent that such information constitutes descriptions of the terms of the Debentures or the Indenture, has been reviewed by us and is accurate in all material respects;

(x) The information in the Registration Statement, the Time of Sale Prospectus and the Prospectus under the caption “Material U.S. Federal Income Tax Considerations,” to the extent that such information constitutes matters of law or legal conclusions, has been reviewed by us and is correct in all material respects;

(xi) The Company is not and, after giving effect to the offering and sale of the Securities and the application of the proceeds therefrom, will not be an “investment company,” as such term is defined in the Investment Company Act;

(xii) The Registration Statement, the Time of Sale Prospectus and the Prospectus (except for the financial statements and schedules included therein, as to which we express no opinion) comply as to form in all material respects with the requirements of the Trust Indenture Act and the Securities Act and the applicable rules and regulations thereunder;

(xiii) The documents incorporated by reference in the Registration Statement, the Time of Sale Prospectus and the Prospectus pursuant to Item 12 of Form S-3 under the Securities Act (other than the financial statements and schedules and financial information and data derived from such financial statements included therein or omitted therefrom, as to which we express no opinion), at the time they were filed with the Commission, complied as to form in all material respects with the requirements of the Exchange Act and the applicable rules and regulations thereunder;

(xiv) Based solely upon such counsel’s review of the information regarding the Company provided through the ▇▇▇▇▇ System on the Commission’s website, the Registration Statement became effective under the Securities Act, and, to such counsel’s knowledge, no stop order suspending the effectiveness of the Registration Statement has been issued under the Securities Act and no proceedings for that purpose have been instituted or threatened by the Commission. The required filings of the Prospectus pursuant to Rule 424(b) under the Securities Act have been made in the manner and within the time period required by Rule 424(b);

(xv) No facts have come to the attention of such counsel to cause it to believe that: (i) the Registration Statement, as of the date of this Agreement, contained an untrue statement of a material fact or omitted to state a material fact required to be stated therein or necessary to make the statements therein not misleading; (ii) the Prospectus, as of its date and as of the date hereof, contained or contains an untrue statement of a material fact or omitted or omits to state a material fact necessary in order to make the statements therein, in the light of the circumstances under which they were made, not misleading; (iii) the Time of Sale Prospectus, as of 5:30 P.M. (Eastern time) on June 9, 2016 (which you have informed us is a time prior to the time of the first sale of the Debentures by any Underwriter), contained an untrue statement of a material fact or omitted to state a material fact necessary in order to make the statements therein, in the light of the circumstances under which they were made, not misleading; (iv) there are any legal or governmental proceedings pending or threatened against the Company that are required to be disclosed in the Registration Statement, the Time of Sale Prospectus, or the Prospectus, other than those disclosed therein; or (v) there are any contracts or documents of a character required to be described in the Registration Statement, the Time of Sale Prospectus, or the Prospectus or to be filed as exhibits to the Registration Statement that are not described or referred to therein or so filed.

(d) The Underwriters shall have received on the Applicable Closing Date an opinion of ▇▇▇▇▇▇▇ ▇. ▇▇▇▇▇▇▇, General Counsel for the Company, dated such Applicable Closing Date, to the effect that:

(i) The Company is a registered bank holding company under the Bank Holding Company Act of 1956, as amended;

(ii) The Company has been duly qualified as a foreign corporation for the transaction of business and is in good standing under the laws of each other jurisdiction in which it owns or leases properties or conducts any business so as to require such qualification, or is subject to no material liability or disability by reason of the failure to be so qualified in any such jurisdiction;

(iii) Western Alliance Bank has been duly incorporated and is validly existing as a corporation in good standing under the laws of the State of Arizona, has corporate power and authority to own, lease and operate its properties and to conduct its banking business; and all of the issued shares of capital stock of Western Alliance Bank have been duly and validly authorized and issued, are fully paid and non-assessable, and are owned directly or indirectly by the Company, free and clear of all liens, encumbrances, equities or claims;

(iv) Other than as set forth in the Registration Statement, Time of Sale Prospectus and Prospectus, there are no legal or governmental proceedings pending to which the Company or any of its subsidiaries is a party or of which any property of the Company or any of its subsidiaries is the subject which, if determined adversely to the Company or any of its subsidiaries, would individually or in the aggregate have a material adverse effect on the current or future consolidated financial position, stockholders’ equity or results of operations of the Company and its subsidiaries; and to the best of my knowledge, no such proceedings are threatened or contemplated by governmental authorities or threatened by others;

(v) The issue and sale of the Securities and the compliance by the Company with this Agreement, the Indenture and the Notes and the consummation of the transactions herein and therein contemplated will not conflict with or result in a breach or violation of any of the terms or provisions of, or constitute a default under, any indenture, mortgage, deed of trust, loan agreement or other agreement or instrument to which the Company or any of its subsidiaries is a party or by which the Company or any of its subsidiaries is bound or to which any of the property or assets of the Company or any of its subsidiaries is subject, nor will such actions result in any violation of the provisions of the certificate of incorporation or articles of incorporation (as applicable) or bylaws of the Company or any of its subsidiaries, each as amended to date, or any statute or any order, rule or regulation of any court or governmental agency or body having jurisdiction over the Company or any of its subsidiaries or any of their properties;

(vi) No consent, approval, authorization, order, registration or qualification of or with any U.S. state or federal banking agency or governing body (including the Federal Reserve and the Arizona Department of Financial Institutions) is required for the issue and sale of the Shares or the consummation by the Company of the transactions contemplated by the Underwriting Agreement, the Indenture and the Notes, except such as have been obtained from the Federal Reserve and under the Securities Act;

(vii) The statements set forth under the caption “Management’s Discussion and Analysis of Financial Condition and Results of Operations — Supervision and Regulation” in the Company’s Annual Report on Form 10-K for the year ended December 31, 2015, as filed with the Commission on February 16, 2016 (the “Form 10-K”) insofar as they purported to describe the provisions of the laws and documents referred to therein, were accurate, complete and fair in all material respects, and the statements set forth under the caption “Risk Factors — The Company operates in a highly regulated environment and the laws and regulations that govern the Company’s operations, corporate governance, executive compensation, and accounting principles, or changes in them, or the Company’s failure to comply with them, may adversely affect the Company” in the Form 10-K insofar as they purported to describe the provisions of the laws and documents referred to therein, fairly and accurately describe such laws and documents in all material respects;

(viii) Western Alliance Bank is an insured depository institution under the provisions of the Federal Deposit Insurance Reform Act of 2005. The activities of Western Alliance Bank as described in the Registration Statement, the Time of Sale Prospectus and the Prospectus are permitted of a state-chartered bank under the laws of its jurisdiction of incorporation, and are permitted under applicable federal banking law, including the rules and regulations of the Federal Reserve set forth in Title 12 of the Code of Federal Regulations.

(ix) The current banking activities of Western Alliance Bank, as described in the Registration Statement, the Time of Sale Prospectus and Prospectus, are permitted for a state-chartered bank under the laws of the State of Arizona.

(e) The Underwriters shall have received on the Applicable Closing Date an opinion of Skadden, Arps, Slate, ▇▇▇▇▇▇▇ & ▇▇▇▇ LLP, counsel for the Underwriters, dated such Applicable Closing Date, covering the matters referred to in Sections 5(c)(iii), 5(c)(iv), 5(c)(v) and 5(c)(ix) (but only as to the statements in each of the Time of Sale Prospectus and the Prospectus under “Description of Debentures,” “Description of Debt Securities” insofar as relevant to the offering of the Securities and “Underwriters”) and Sections 5(c)(xii), 5(c)(xiii) and 5(c)(xv) above.

With respect to Section 5(c)(xv) above, counsel for the Company may state that their opinions and beliefs are based upon their participation in the preparation of the Registration Statement, the Time of Sale Prospectus, the Prospectus and any amendments or supplements thereto and review and discussion of the contents thereof, but are without independent check or verification, except as specified. With respect to clauses 5(c)(xii), 5(c)(xiii) and 5(c)(xv) above, Skadden, Arps, Slate, ▇▇▇▇▇▇▇ & ▇▇▇▇ LLP may state that their opinions and beliefs are based upon their participation in the preparation of the Time of Sale Prospectus, the Prospectus, and any amendments or supplements thereto (other than the documents incorporated by reference) and upon review and discussion of the contents of the Registration Statement, the Time of Sale Prospectus and the Prospectus (including documents incorporated by reference), but are without independent check or verification, except as specified.

The opinion of counsel for the Company described in Section 5(c) above shall be rendered to the Underwriters at the request of the Company and shall so state therein.

(f) The Underwriters shall have received, on each of the date hereof and the Applicable Closing Date, a letter dated the date hereof or such Applicable Closing Date, as the case may be, in form and substance satisfactory to the Underwriters, from RSM US LLP, independent public accountants, containing statements and information of the type ordinarily included in accountants’ “comfort letters” to underwriters with respect to the financial statements and certain financial information contained in the Registration Statement, the Time of Sale Prospectus and the Prospectus; provided that the letter delivered on the Applicable Closing Date shall use a “cut-off date” not earlier than the date hereof.

6. Covenants of the Company. The Company covenants with each Underwriter as follows:

(a) To furnish to you, without charge, a signed copy of the Registration Statement (including exhibits thereto and documents incorporated by reference therein) and to deliver to each of the Underwriters during the period mentioned in Section 6(e) or 6(f) below, as many copies of the Time of Sale Prospectus, the Prospectus, any documents incorporated by reference therein and any supplements and amendments thereto or to the Registration Statement as you may reasonably request.

(b) Before amending or supplementing the Registration Statement, the Time of Sale Prospectus or the Prospectus, to furnish to you a copy of each such proposed amendment or supplement and not to file any such proposed amendment or supplement to which you reasonably object.

(c) To furnish to you a copy of each proposed free writing prospectus to be prepared by or on behalf of, used by, or referred to by the Company and not to use or refer to any proposed free writing prospectus to which you reasonably object.

(d) Not to take any action that would result in an Underwriter or the Company being required to file with the Commission pursuant to Rule 433(d) under the Securities Act a free writing prospectus prepared by or on behalf of the Underwriter that the Underwriter otherwise would not have been required to file thereunder.

(e) If the Time of Sale Prospectus is being used to solicit offers to buy the Securities at a time when the Prospectus is not yet available to prospective purchasers and any event shall occur or condition exist as a result of which it is necessary to amend or supplement the Time of Sale Prospectus in order to make the statements therein, in the light of the circumstances, not misleading, or if any event shall occur or condition exist as a result of which the Time of Sale Prospectus conflicts with the information contained in the Registration Statement then on file, or if, in the opinion of counsel for the Underwriters, it is necessary to amend or supplement the Time of Sale Prospectus to comply with applicable law, forthwith to prepare, file with the Commission and furnish, at its own expense, to the Underwriters and to any dealer upon request, either amendments or supplements to the Time of Sale Prospectus so that the statements in the Time of Sale Prospectus as so amended or supplemented will not, in the light of the circumstances when the Time of Sale Prospectus is delivered to a prospective purchaser, be misleading or so that the Time of Sale Prospectus, as amended or supplemented, will no longer conflict with the Registration Statement, or so that the Time of Sale Prospectus, as amended or supplemented, will comply with applicable law.

(f) If, during such period after the first date of the public offering of the Securities as in the opinion of counsel for the Underwriters the Prospectus (or in lieu thereof the notice referred to in Rule 173(a) of the Securities Act) is required by law to be delivered in connection with sales by an Underwriter or dealer, any event shall occur or condition exist as a result of which it is necessary to amend or supplement the Prospectus in order to make the statements therein, in the light of the circumstances when the Prospectus (or in lieu thereof the notice referred to in Rule 173(a) of the Securities Act) is delivered to a purchaser, not misleading, or if, in the opinion of counsel for the Underwriters, it is necessary to amend or supplement the Prospectus to comply with applicable law, forthwith to prepare, file with the

Commission and furnish, at its own expense, to the Underwriters and to the dealers (whose names and addresses you will furnish to the Company) to which Securities may have been sold by you on behalf of the Underwriters and to any other dealers upon request, either amendments or supplements to the Prospectus so that the statements in the Prospectus as so amended or supplemented will not, in the light of the circumstances when the Prospectus (or in lieu thereof the notice referred to in Rule 173(a) of the Securities Act) is delivered to a purchaser, be misleading or so that the Prospectus, as amended or supplemented, will comply with applicable law.

(g) To endeavor to qualify the Securities for offer and sale under the securities or Blue Sky laws of such jurisdictions as you shall reasonably request.

(h) To make generally available to the Company’s security holders and to you as soon as practicable an earnings statement covering a period of at least twelve months beginning with the first fiscal quarter of the Company occurring after the date of this Agreement which shall satisfy the provisions of Section 11(a) of the Securities Act and the rules and regulations of the Commission thereunder.

(i) Whether or not the transactions contemplated in this Agreement are consummated or this Agreement is terminated, to pay or cause to be paid all expenses incident to the performance of its obligations under this Agreement, including: (i) the fees, disbursements and expenses of the Company’s counsel and the Company’s accountants in connection with the registration and delivery of the Securities under the Securities Act and all other fees or expenses in connection with the preparation and filing of the Registration Statement, any preliminary prospectus, the Time of Sale Prospectus, the Prospectus, any free writing prospectus prepared by or on behalf of, used by, or referred to by the Company and amendments and supplements to any of the foregoing, including the filing fees payable to the Commission relating to the Securities (within the time required by Rule 456 (b)(1), if applicable), all printing costs associated therewith, and the mailing and delivering of copies thereof to the Underwriters and dealers, in the quantities hereinabove specified, (ii) all costs and expenses related to the transfer and delivery of the Securities to the Underwriters, including any transfer or other taxes payable thereon, (iii) the cost of printing or producing any Blue Sky or legal investment memorandum in connection with the offer and sale of the Securities under state securities laws and all expenses in connection with the qualification of the Securities for offer and sale under state securities laws as provided in Section 6(g) hereof, including filing fees and the reasonable fees and disbursements of counsel for the Underwriters in connection with such qualification and in connection with the Blue Sky or legal investment memorandum,

(iv) all filing fees and the reasonable fees and disbursements of counsel to the Underwriters incurred in connection with the review and qualification of the offering of the Securities by the Financial Industry Regulatory Authority, (v) any fees charged by the rating agencies for the rating of the Securities, (vi) all fees and expenses in connection with the preparation and filing of the registration statement on Form 8-A relating to the Securities and all costs and expenses incident to listing the Securities on the NYSE, (vii) the cost of the preparation, issuance and delivery of the Securities, (viii) the costs and charges of any trustee, transfer agent, registrar or depositary, (ix) the costs and expenses of the Company relating to investor presentations on any “road show” undertaken in connection with the marketing of the offering of the Securities, including, without limitation, expenses associated with the preparation or dissemination of any electronic road show, expenses associated with the production of road show slides and graphics, fees and expenses of any consultants engaged in connection with the road show presentations with the prior approval of the Company, travel and lodging expenses of the representatives and officers of the Company and any such consultants, (x) the document production charges and expenses associated with printing this Agreement and (xi) all other costs and expenses incident to the performance of the obligations of the Company hereunder for which provision is not otherwise made in this Section. It is understood, however, that except as provided in this Section, Section 8 entitled “Indemnity and Contribution,” and the last paragraph of Section 10 below, the Underwriters will pay all of their costs and expenses, including fees and disbursements of their counsel, transfer taxes payable on resale of any of the Securities by them and any advertising expenses connected with any offers they may make.

(j) If the third anniversary of the initial effective date of the Registration Statement occurs before all the Securities have been sold by the Underwriters, prior to the third anniversary to file a new shelf registration statement and to take any other action necessary to permit the public offering of the Securities to continue without interruption; references herein to the Registration Statement shall include the new registration statement declared effective by the Commission;

(k) During the period beginning on the date hereof and continuing to and including 30 days after the Closing Date, not to offer, sell, contract to sell or otherwise dispose of any debt securities of the Company or warrants to purchase or otherwise acquire debt securities of the Company substantially similar to the Securities (other than (i) the Securities, (ii) commercial paper issued in the ordinary course of business or (iii) securities or warrants permitted with the prior written consent of the Managers).

(l) To prepare a final term sheet relating to the offering of the Securities, containing only information that describes the final terms of the Securities or the offering in a form consented to by the Managers, and to file such final term sheet within the period required by Rule 433(d)(5)(ii) under the Securities Act following the date the final terms have been established for the offering of the Securities.

7. Covenants of the Underwriters. Each Underwriter severally covenants with the Company not to take any action that would result in the Company being required to file with the Commission under Rule 433(d) a free writing prospectus prepared by or on behalf of such Underwriter that otherwise would not be required to be filed by the Company thereunder, but for the action of the Underwriter.

8. Indemnity and Contribution. (a) The Company agrees to indemnify and hold harmless each Underwriter, each person, if any, who controls any Underwriter within the meaning of either Section 15 of the Securities Act or Section 20 of the Exchange Act and each affiliate of any Underwriter within the meaning of Rule 405 under the Securities Act from and against any and all losses, claims, damages and liabilities (including, without limitation, any legal or other expenses reasonably incurred in connection with defending or investigating any such action or claim) caused by any untrue statement or alleged untrue statement of a material fact contained in the Registration Statement or any amendment thereof, any preliminary prospectus, the Time of Sale Prospectus or any amendment or supplement thereto, any issuer free writing prospectus as defined in Rule 433(h) under the Securities Act, any Company information that the Company has filed, or is required to file, pursuant to Rule 433(d) under the Securities Act, any “road show” as defined in Rule 433(h) under the Securities Act (a “road show”), or the Prospectus or any amendment or supplement thereto, or caused by any omission or alleged omission to state therein a material fact required to be stated therein or necessary to make the statements therein not misleading, except insofar as such losses, claims, damages or liabilities are caused by any such untrue statement or omission or alleged untrue statement or omission based upon information relating to any Underwriter furnished to the Company in writing by such Underwriter through you expressly for use therein.

(b) Each Underwriter agrees, severally and not jointly, to indemnify and hold harmless the Company, its directors, its officers who sign the Registration Statement and each person, if any, who controls the Company within the meaning of either Section 15 of the Securities Act or Section 20 of the Exchange Act to the same extent as the foregoing indemnity from the Company to such Underwriter, but only with reference to information relating to such Underwriter furnished to the Company in writing by such Underwriter through you expressly for use in the Registration Statement, any preliminary prospectus, the Time of Sale Prospectus, any issuer free writing prospectus, road show, or the Prospectus or any amendment or supplement thereto.

(c) In case any proceeding (including any governmental investigation) shall be instituted involving any person in respect of which indemnity may be sought pursuant to Section 8(a) or 8(b), such person (the “indemnified party”) shall promptly notify the person against whom such indemnity may be sought (the “indemnifying party”) in writing and the indemnifying party, upon request of the indemnified party, shall retain counsel reasonably satisfactory to the indemnified party to represent the indemnified party and any others the indemnifying party may designate in such proceeding and shall pay the fees and disbursements of such counsel related to such proceeding. In any such proceeding, any indemnified party shall have the right to retain its own counsel, but the fees and expenses of such counsel shall be at the expense of such indemnified party unless (i) the indemnifying party and the indemnified party shall have mutually agreed to the retention of such counsel or (ii) the named parties to any such proceeding (including any impleaded parties) include both the indemnifying party and the indemnified party and representation of both parties by the same counsel would be inappropriate due to actual or potential differing interests between them. It is understood that the indemnifying party shall not, in respect of the legal expenses of any indemnified party in connection with any proceeding or related proceedings in the same jurisdiction, be liable for the fees and expenses of more than one separate firm (in addition to any local counsel) for all such indemnified parties and that all such fees and expenses shall be reimbursed as they are incurred. Such firm shall be designated in writing by the Managers, in the case of parties indemnified pursuant to Section 8(a), and by the Company, in the case of parties indemnified pursuant to Section 8(b). The indemnifying party shall not be liable for any settlement of any proceeding effected without its written consent, but if settled with such consent or if there be a final judgment for the plaintiff, the indemnifying party agrees to indemnify the indemnified party from and against any loss or liability by reason of such settlement or judgment. Notwithstanding the foregoing sentence, if at any time an indemnified party shall have requested an indemnifying party to reimburse the indemnified party for fees and expenses of counsel as contemplated by the second and third sentences of this paragraph, the indemnifying party agrees that it shall be liable for any settlement of any proceeding effected without its written consent if (i) such settlement is entered into more than 30 days after receipt by such indemnifying party of the aforesaid request and (ii) such indemnifying party shall not have reimbursed the indemnified party in accordance with such request prior to the date of such settlement. No indemnifying party shall, without the prior written consent of the indemnified party, effect any settlement of any pending or threatened proceeding in respect of which any indemnified party is or could have been a party and indemnity could have been sought hereunder by such indemnified party, unless such settlement includes an unconditional release of such indemnified party from all liability on claims that are the subject matter of such proceeding.

(d) To the extent the indemnification provided for in Section 8(a) or 8(b) is unavailable to an indemnified party or insufficient in respect of any losses, claims, damages or liabilities referred to therein, then each indemnifying party under such paragraph, in lieu of indemnifying such indemnified party thereunder, shall contribute to the amount paid or payable by such indemnified party as a result of such losses, claims, damages or liabilities (i) in such proportion as is appropriate to reflect the relative benefits received by the Company on the one hand and the Underwriters on the other hand from the offering of the Securities or (ii) if the allocation provided by clause 8(d)(i) above is not permitted by applicable law, in such proportion as is appropriate to reflect not only the relative benefits referred to in clause 8(d)(i) above but also the relative fault of the Company on the one hand and of the Underwriters on the other hand in connection with the statements or omissions that resulted in such losses, claims, damages or liabilities, as well as any other relevant equitable considerations. The relative benefits received by the Company on the one hand and the Underwriters on the other hand in connection with the offering of the Securities shall be deemed to be in the same respective proportions as the net proceeds from the offering of the Securities (before deducting expenses) received by the Company and the total underwriting discounts and commissions received by the Underwriters bear to the aggregate initial public offering price of the Securities as set forth in the Prospectus. The relative fault of the Company on the one hand and the Underwriters on the other hand shall be determined by reference to, among other things, whether the untrue or alleged untrue statement of a material fact or the omission or alleged omission to state a material fact relates to information supplied by the Company or by the Underwriters and the parties’ relative intent, knowledge, access to information and opportunity to correct or prevent such statement or omission. The Underwriters’ respective obligations to contribute pursuant to this Section 8 are several in proportion to the respective principal amounts of Securities they have purchased hereunder, and not joint.

(e) The Company and the Underwriters agree that it would not be just or equitable if contribution pursuant to this Section 8 were determined by pro rata allocation (even if the Underwriters were treated as one entity for such purpose) or by any other method of allocation that does not take account of the equitable considerations referred to in Section 8(d). The amount paid or payable by an indemnified party as a result of the losses, claims, damages and liabilities referred to in Section 8(d) shall be deemed to include, subject to the limitations set

forth above, any legal or other expenses reasonably incurred by such indemnified party in connection with investigating or defending any such action or claim. Notwithstanding the provisions of this Section 8, no Underwriter shall be required to contribute any amount in excess of the amount by which the total price at which the Securities underwritten by it and distributed to the public were offered to the public exceeds the amount of any damages that such Underwriter has otherwise been required to pay by reason of such untrue or alleged untrue statement or omission or alleged omission. No person guilty of fraudulent misrepresentation (within the meaning of Section 11(f) of the Securities Act) shall be entitled to contribution from any person who was not guilty of such fraudulent misrepresentation. The remedies provided for in this Section 8 are not exclusive and shall not limit any rights or remedies which may otherwise be available to any indemnified party at law or in equity.

(f) The indemnity and contribution provisions contained in this Section 8 and the representations, warranties and other statements of the Company contained in this Agreement shall remain operative and in full force and effect regardless of (i) any termination of this Agreement, (ii) any investigation made by or on behalf of any Underwriter, any person controlling any Underwriter or any affiliate of any Underwriter or by or on behalf of the Company, its officers or directors or any person controlling the Company and (iii) acceptance of and payment for any of the Securities.

9. Termination. The Underwriters may terminate this Agreement by notice given by you to the Company, if after the execution and delivery of this Agreement and prior to the Closing Date (i) trading generally shall have been suspended or materially limited on, or by, as the case may be, any of the New York Stock Exchange, the NYSE MKT, the NASDAQ Global Market, the Chicago Board of Options Exchange, the Chicago Mercantile Exchange or the Chicago Board of Trade or other relevant exchanges, (ii) trading of any securities of the Company shall have been suspended on any exchange or in any over-the-counter market, (iii) a material disruption in securities settlement, payment or clearance services in the United States or other relevant jurisdiction shall have occurred, (iv) any moratorium on commercial banking activities shall have been declared by Federal or New York State authorities or (v) there shall have occurred any outbreak or escalation of hostilities, or any change in financial markets or any calamity or crisis that, in your judgment, is material and adverse and which, singly or together with any other event specified in this clause (v), makes it, in your judgment, impracticable or inadvisable to proceed with the offer, sale or delivery of the Securities on the terms and in the manner contemplated in the Time of Sale Prospectus or the Prospectus.

10. Effectiveness; Defaulting Underwriters. This Agreement shall become effective upon the execution and delivery hereof by the parties hereto.

If, on the Closing Date, any one or more of the Underwriters shall fail or refuse to purchase Securities that it has or they have agreed to purchase hereunder on such date, and the aggregate principal amount of Securities which such defaulting Underwriter or Underwriters agreed but failed or refused to purchase is not more than one-tenth of the aggregate principal amount of the Securities to be purchased on such date, the other Underwriters shall be obligated severally in the proportions that the principal amount of Securities set forth opposite their respective names in Schedule II bears to the aggregate principal amount of Securities set forth opposite the names of all such non-defaulting Underwriters, or in such other proportions as you may specify, to purchase the Securities which such defaulting Underwriter or Underwriters agreed but failed or refused to purchase on such date; provided that in no event shall the principal amount of Securities that any Underwriter has agreed to purchase pursuant to this Agreement be increased pursuant to this Section 10 by an amount in excess of one-ninth of such principal amount of Securities without the written consent of such Underwriter. If, on the Closing Date, any Underwriter or Underwriters shall fail or refuse to purchase Securities and the aggregate principal amount of Securities with respect to which such default occurs is more than one-tenth of the aggregate principal amount of Securities to be purchased on such date, and arrangements satisfactory to you and the Company for the purchase of such Securities are not made within 36 hours after such default, this Agreement shall terminate without liability on the part of any non-defaulting Underwriter or the Company. In any such case either you or the Company shall have the right to postpone the Closing Date, but in no event for longer than seven days, in order that the required changes, if any, in the Registration Statement, in the Time of Sale Prospectus, in the Prospectus or in any other documents or arrangements may be effected. Any action taken under this paragraph shall not relieve any defaulting Underwriter from liability in respect of any default of such Underwriter under this Agreement.

If this Agreement shall be terminated by the Underwriters, or any of them, because of any failure or refusal on the part of the Company to comply with the terms or to fulfill any of the conditions of this Agreement, or if for any reason the Company shall be unable to perform its obligations under this Agreement the Company will reimburse the Underwriters or such Underwriters as have so terminated this Agreement with respect to themselves, severally, for all out-of-pocket expenses (including the fees and disbursements of their counsel) reasonably incurred by such Underwriters in connection with this Agreement or the offering contemplated hereunder.

11. Entire Agreement. (a) This Agreement, together with any contemporaneous written agreements and any prior written agreements (to the extent not superseded by this Agreement) that relate to the offering of the Securities, represents the entire agreement between the Company and the Underwriters with respect to the preparation of any preliminary prospectus, the Time of Sale Prospectus, the Prospectus, the conduct of the offering, and the purchase and sale of the Securities.

(b) The Company acknowledges that in connection with the offering of the Securities: (i) the Underwriters have acted at arm’s length, are not agents of, and owe no fiduciary duties to, the Company or any other person, (ii) the Underwriters owe the Company only those

duties and obligations set forth in this Agreement and prior written agreements (to the extent not superseded by this Agreement), if any, and (iii) the Underwriters may have interests that differ from those of the Company. The Company waives to the full extent permitted by applicable law any claims it may have against the Underwriters arising from an alleged breach of fiduciary duty in connection with the offering of the Securities.

12. Counterparts. This Agreement may be signed in two or more counterparts, each of which shall be an original, with the same effect as if the signatures thereto and hereto were upon the same instrument.

13. Applicable Law. This Agreement shall be governed by and construed in accordance with the internal laws of the State of New York.

14. Headings. The headings of the sections of this Agreement have been inserted for convenience of reference only and shall not be deemed a part of this Agreement.

15. Notices. All communications hereunder shall be in writing and effective only upon receipt and if to the Underwriters shall be delivered, mailed or sent to you at the address set forth in Schedule I hereto; and if to the Company shall be delivered, mailed or sent to the address set forth in Schedule I hereto.


Very truly yours, WESTERN ALLIANCE BANCORPORATION

By:		/s/ ▇▇▇▇▇▇▇ ▇. ▇▇▇▇▇▇▇
		Name: ▇▇▇▇▇▇▇ ▇. ▇▇▇▇▇▇▇
		Title: EVP, General Counsel


Accepted as of the date hereof ▇▇▇▇▇▇ ▇▇▇▇▇▇▇ & CO. LLC ▇▇▇▇▇ FARGO SECURITIES, LLC Acting severally on behalf of themselves and the several Underwriters named in Schedule II hereto

		▇▇▇▇▇▇ ▇▇▇▇▇▇▇ & CO. LLC

By:		/s/ Yurij Slyz
		Name: Yurij Slyz
		Title: Executive Director

		▇▇▇▇▇ FARGO SECURITIES, LLC

By:		/s/ ▇▇▇▇ ▇▇▇▇
		Name: ▇▇▇▇ ▇▇▇▇
		Title: Managing Director

SCHEDULE I


Managers:		▇▇▇▇▇▇ ▇▇▇▇▇▇▇ & Co. LLC ▇▇▇▇▇ Fargo Securities, LLC
Indenture:		Indenture dated as of June 16, 2016 between the Company and the Trustee

Trustee:		The Bank of New York Mellon Trust Company, N.A.

Registration Statement File No.:		333-203959

Time of Sale Prospectus		1. Prospectus dated May 7, 2015 relating to the Shelf Securities 2. Preliminary prospectus supplement dated June 9, 2016 relating to the Securities 3. Pricing term sheet dated June 9, 2016 filed by the Company under Rule 433(d) of the Securities Act

Securities to be purchased:		6.25% Subordinated Debentures due 2056

Principal Amount of Firm Securities:		$175,000,000

Purchase Price:		96.85% of the principal amount of the Securities, plus accrued and unpaid interest, if any, from June 16, 2016 to the date of delivery

Maturity:		July 1, 2056

Interest Rate:		6.25% per annum, accruing from June 16, 2016

Interest Payment Dates:		July 1, October 1, January 1 and April 1 commencing October 1, 2016

Closing Date and Time:		June 16, 2016 at 9:00 a.m.

Closing Location:		Skadden, Arps, Slate, ▇▇▇▇▇▇▇ & ▇▇▇▇ LLP ▇▇▇ ▇▇▇▇▇ ▇▇▇▇▇ ▇▇▇▇▇▇, ▇▇▇▇▇ ▇▇▇▇ ▇▇▇ ▇▇▇▇▇▇▇, ▇▇▇▇▇▇▇▇▇▇ ▇▇▇▇▇

I-1



Address for Notices to Underwriters:		▇▇▇▇▇▇ ▇▇▇▇▇▇▇ & Co. LLC ▇▇▇▇ ▇▇▇▇▇▇▇▇ ▇▇▇ ▇▇▇▇, ▇▇▇ ▇▇▇▇ ▇▇▇▇▇ Fax: ▇▇▇-▇▇▇-▇▇▇▇ Attention: Investment Banking Division ▇▇▇▇▇ Fargo Securities, LLC ▇▇▇ ▇▇▇▇▇ ▇▇▇▇▇ ▇▇▇▇▇▇, ▇^▇▇ ▇▇▇▇▇ ▇▇▇▇▇▇▇▇▇, ▇▇▇▇▇ ▇▇▇▇▇▇▇▇ ▇▇▇▇▇ Fax: ▇▇▇-▇▇▇-▇▇▇▇ Attention: Transaction Management

Address for Notices to the Company:		Western Alliance Bancorporation ▇▇▇ ▇. ▇▇▇▇▇▇▇▇▇▇ ▇▇▇▇▇▇ ▇▇▇▇▇ ▇▇▇▇ ▇▇▇▇▇▇▇, ▇▇▇▇▇▇▇ ▇▇▇▇▇ Attention: Chief Financial Officer

I-2

SCHEDULE II


Underwriter	Principal Amount of Firm Securities To Be Purchased
▇▇▇▇▇▇ ▇▇▇▇▇▇▇ & CO. LLC	$	70,000,000
▇▇▇▇▇ FARGO SECURITIES, LLC	$	70,000,000
▇.▇. ▇▇▇▇▇▇▇▇ & CO.	$	8,750,000
FIG PARTNERS, LLC	$	8,750,000
▇▇▇▇▇▇▇▇▇ LLC	$	8,750,000
▇▇▇▇▇ ▇▇▇▇▇▇▇ & CO.	$	8,750,000

Total	$	175,000,000

WESTERN ALLIANCE BANCORPORATION $175,000,000 6.25% SUBORDINATED DEBENTURES DUE 2056 UNDERWRITING AGREEMENT

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