Exhibit 99.1

FIRST AMENDMENT TO VOTING AGREEMENT

This First Amendment to Voting Agreement (“First Amendment”) is entered into as of October 4, 2013 by and among Parkway Properties, Inc., (“Parent”), Parkway Properties LP (“Parent LP”, and, together with Parent, the “Parent Parties”) and the undersigned stockholders (each a “Stockholder” and collectively, the “Stockholders”) of Thomas Properties Group, Inc. (“Company”).

Parent Parties and Stockholders are parties to a Voting Agreement dated as of September 4, 2013 (“Voting Agreement”).

Parent Parties and Stockholders have determined that Schedule A attached to the Voting Agreement failed to reflect certain shares of stock in Company owned by Stockholders.

Parent Parties and Stockholders hereby substitute the attached Schedule A in place of the Schedule A which was attached to the Voting Agreement and any reference to Schedule A in the Voting Agreement shall be deemed to refer to the Schedule A attached hereto.

[Signature page follows]

IN WITNESS WHEREOF, the parties have caused this First Amendment to be duly executed on the date and year first above written.

PARENT
PARKWAY PROPERTIES, INC.
By:	/s/ David O’Reilly
Name:	David O’Reilly
Title:	Chief Financial Officer and
	Chief Investment Officer
By:	/s/ Jeremy Dorsett
Name:	Jeremy Dorsett
Title:	General Counsel
PARENT LP
PARKWAY PROPERTIES LP
By:	PARKWAY PROPERTIES
	GENERAL PARTNERS, INC., its
	General Partner
By:	/s/ David O’Reilly
Name:	David O’Reilly
Title:	Chief Financial Officer and
	Chief Investment Officer
By:	/s/ Jeremy Dorsett
Name:	Jeremy Dorsett
Title:	General Counsel

STOCKHOLDERS:
/s/ James A. Thomas
James A. Thomas
MAGUIRE THOMAS PARTNERS-PHILADELPHIA, LTD.
By:	THOMAS PARTNERS, INC.
	Its General Partner
By:	/s/ James A. Thomas
Name:	James A. Thomas
Title:	President
THOMAS INVESTMENT PARTNERS, LTD.
By:	THOMAS PARTNERS, INC.
	Its General Partner
By:	/s/ James A. Thomas
Name:	James A. Thomas
Title:	President
MAGUIRE THOMAS PARTNERS-COMMERCE SQUARE II, LTD.
By:	THOMAS DEVELOPMENT PARTNERS-PHASE II, INC.
	Its General Partner
By:	/s/ James A. Thomas
Name:	James A. Thomas
Title:	President
THOMAS PARTNERS, INC.
By:	/s/ James A. Thomas
Name:	James A. Thomas
Title:	President

THE LUMBEE CLAN TRUST
By:	/s/ James A. Thomas
Name:	James A. Thomas
Title:	Trustee
THOMAS MASTER INVESTMENTS, LLC
By:	THOMAS PARTNERS, INC.
	Its Managing Member
By:	/s/ James A. Thomas
Name:	James A. Thomas
Title:	President

Acknowledged:

COMPANY
THOMAS PROPERTIES GROUP, INC.
By:	/s/ James A. Thomas
Name:	James A. Thomas
Title:	President and Chief Executive Officer

Schedule A

Name	Common Stock		Limited Voting Stock		OP Units (Paired with Limited Voting Stock)		Restricted Common Stock (Unvested)
James A. Thomas		1,800						87,996
Maguire Thomas Partners - Philadelphia, Ltd.				3,514,557		3,514,557
Thomas Investment Partners, Ltd.		2,814,800		3,204,761		3,204,761
Maguire Thomas Partners - Commerce Square II, Ltd.				2,308,452		2,308,452
Thomas Partners, Inc.				136,866		136,866
Thomas-Pastron Family Partnership, L.P.		666,382
The Lumbee Clan Trust		807,631		1,852,818		1,852,818
Thomas Master Investments, LLC				629,495		629,495
Rosemary Pastron Trust		10,193
Otto Pastron Trust		10,386
Otto Pastron CUTMA		550
James A. Thomas (voting agreement with MIRELF IV TPGI, LLC)		7,338,260
James A. Thomas (voting agreement with MIRELF IV TPGI II, LLC)		1,357,393
Total		13,007,395		11,646,949		11,646,949		87,996