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Exhibit 10.1

May 6, 2016

COUSINS PROPERTIES INCORPORATED

191 Peachtree Street NE, Suite 500

Atlanta, Georgia 30303

Attention: Pamela F. Roper

Ladies and Gentlemen:

Reference is made to that certain Limited Partnership Agreement of Parkway Properties Office Fund II, L.P. (the “Partnership”), dated as of May 14, 2008 (as amended from time to time, the “Partnership Agreement”), by and among PPOF II, LLC, a Delaware limited liability company, as the general partner of the Partnership (the “General Partner”), Parkway Properties LP, a Delaware limited partnership (“Parkway”), and Teacher Retirement System of Texas, a public pension fund and public entity of the State of Texas (“TRST” and together with Parkway, the “Limited Partners”).

WHEREAS, Parkway and the General Partner have provided notice to TRST that Parkway and Parkway Properties, Inc., a Maryland corporation (“Parkway Parent”), have entered into an Agreement and Plan of Merger (the “Merger Agreement”), dated as of April 28, 2016, by and among Cousins Properties Incorporated, a Georgia corporation (“Cousins”) and Clinic Sub Inc., a wholly owned subsidiary of Cousins (the “Merger”).

WHEREAS, TRST, as a limited partner of the Partnership, wishes to agree that the execution of the Merger Agreement and the consummation of the transactions contemplated thereby, on the terms and conditions set forth in the Merger Agreement (collectively, the “Transactions”) shall not constitute (1) a “Change of Control” under the Partnership Agreement, including under Sections 9.4 or 13.1 thereof, (2) “Cause” under the Partnership Agreement, including under Section 13.1 thereof, or (3) a restricted “transfer” or “Transfer” by PPLP or the General Partner of their respective interests under the Partnership Agreement, including under Section 12.1 thereof.

WHEREAS, TRST, as a limited partner of the Partnership, the General Partner, Parkway and Cousins, as the successor in interest to Parkway Parent upon consummation of the Merger, wish to agree to the modification of the Partnership Agreement as set forth in the attached Amendment, which shall become automatically effective upon the Closing (as such term is defined in the Merger Agreement).

NOW, THEREFORE, in consideration of the mutual covenants herein contained, and other valuable consideration, the receipt and sufficiency of which are hereby acknowledged, and intending to be legally bound hereby, the parties hereto agree as follows:

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IN WITNESS WHEREOF, the parties hereto have executed this letter agreement as of the date first written above.

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