Additions and Alterations Tenant shall not make any additions, alterations or improvements to the Leased Premises without the prior written consent of the Landlord, which shall not be unreasonably withheld, delayed, or qualified. Upon such consent, such repairs shall be subject to the following: a) No alteration shall be undertaken until Tenant shall have procured and paid for, so far as the same may be required from time to time, all permits and authorizations of all municipal departments and governmental subdivisions having jurisdiction. Landlord shall join in the application for such permits or authorizations whenever such action is necessary. b) Any non-structural alteration involving an estimated cost of more than Fifty Thousand and no/100 Dollars ($50,000.00) and any structural alteration, regardless of cost, shall be conducted under the supervision of an architect or engineer selected and paid by Tenant and approved in writing by Landlord (such approval not to be unreasonably withheld), and no such alteration shall be made except in accordance with detailed plans and specifications prepared by such architect or engineer and approved in writing by Landlord. c) Any alteration shall be made promptly (unavoidable delays excepted), in a workmanlike manner and in compliance with all applicable permits and authorizations and with all laws, ordinances, orders, rules, regulations and requirements of all governmental authorities having jurisdiction, and in accordance with the orders, rules and regulations of the National Board of Fire Underwriters or any other body hereafter exercising similar functions. d) Except for the alterations covered by the Improvement Allowances specified in Paragraph 19(b), the cost of any additions or alterations shall be paid by Tenant so that the Leased Premises shall at all times be free of liens for labor and materials supplied or claimed to have been supplied to the Leased Premises. e) Workmen's compensation insurance covering all persons employed in connection with the work and with respect to whom death or bodily injury claims could be asserted against Landlord, Tenant or the Leased Premises, and builder's risk insurance for the mutual benefit of Tenant and Landlord in such limits as Landlord may reasonably require, shall be maintained by Tenant at Tenant's sole cost at all times when any work is in process in connection with any change or alteration. Any and all alterations and improvements to the Leased Premises made by Tenant shall remain at the termination of this Lease and shall be and become the property of Landlord; however, should Landlord so elect, Landlord may require Tenant to remove any and all alterations and improvements and restore the Leased Premises to a state of good and substantial repair, order and condition if so stated in writing by Landlord in conjunction with the approval of such work.