US-DOCS\51573375.10 SPIRIT REALTY, L.P., SPIRIT REALTY CAPITAL, INC., AS GUARANTOR, AND U.S. BANK NATIONAL ASSOCIATION, AS TRUSTEE FIRST SUPPLEMENTAL INDENTURE DATED AS OF AUGUST 18, 2016 TO INDENTURE DATED AUGUST 18, 2016 $300,000,000 OF 4.450% NOTES...