Sacramento, CA – December 16, 2008 — The California Sustainability Alliance, a market transformation program managed by Navigant Consulting, Inc. (NYSE: NCI), announced today that it has selected Thomas Properties Group, Inc. (NASDAQ: TPGI) as the second recipient of its Excellence in Sustainability Showcase Award.

The Sustainability Showcase was established to highlight the efforts of organizations in the State of California paving the way towards California’s sustainable future. Thomas Properties Group has distinguished itself as a leader by making sustainability a key element of the company’s business proposition, and applying green building considerations to all aspects of their business including development, investments, leasing and operations.

“Our company and its predecessor have been involved in developing environmentally sustainable projects for over twenty years,” said James Thomas, Chairman, Chief Executive Officer and President of Thomas Properties Group. “We are proud to be at the forefront of “greening” California’s commercial office space, and we greatly appreciate being recognized for our commitment to sustainability.”

A pioneer in sustainable real estate, Thomas Properties Group designed and built the California Environmental Protection Agency’s (Cal EPA) headquarters in Sacramento, the first LEED EB Platinum high rise building in the nation which also boasts an ENERGY STAR rating of 99. The award winning building was designed and constructed incorporating design and engineering principles that conserve both energy and natural resources. Because of the building’s efficient design, the State of California, the tenant of the Cal EPA building, estimates that it saves more than $1.4 million in operating costs annually.

Consistent with the company’s history of being a pioneer in sustainability, Thomas Properties Group has set the ambitious goal of greening its entire portfolio of existing properties – a total of thirty-five buildings with more than 15 million square feet of Class A office space nationwide.

“Market transformation starts with a handful of visionary organizations and individuals raising the bar,” explained Craig McDonald, a Managing Director with Navigant Consulting’s Energy Efficiency Group “Thomas Properties Group is among those organizations and is a distinguished leader in California’s green building efforts.”

Thomas Properties Group will be honored at The California Sustainability Alliance Showcase Awards Luncheon to be held in February 2009 in Sacramento, CA. To learn more about Thomas Properties Group’s sustainability efforts, visit the California Sustainability Alliance’s Sustainability Showcase at www.sustainca.org/showcase/thomasprop.

About Navigant Consulting
Navigant Consulting, Inc. (NYSE: NCI) is a specialized independent consulting firm providing dispute, financial, regulatory and operational advisory services to government agencies, legal counsel and large companies facing the challenges of uncertainty, risk, distress and significant change. The Company focuses on industries undergoing substantial regulatory or structural change including healthcare, energy and financial and insurance services, and on the issues driving these transformations. "Navigant" is a service mark of Navigant International, Inc. Navigant Consulting, Inc. (NCI) is not affiliated, associated, or in any way connected with Navigant International, Inc. and NCI's use of "Navigant" is made under license from Navigant International, Inc. More information about Navigant Consulting can be found at www.navigantconsulting.com.

About The California Sustainability Alliance
The California Sustainability Alliance was designed to help meet the State of California’s aggressive energy, climate and resource and environmental goals by increasing and accelerating energy efficiency in combination with complementary green measures and strategies. Founded in 2006, The California Sustainability Alliance is an innovative market transformation program funded by California utility customers and administered by Southern California Gas Company (The Gas CompanySM) under the auspices of the California Public Utilities Commission, through a contract awarded to Navigant Consulting. California customers who choose to participate in this program are not obligated to purchase any additional services offered by the contractor. The trademarks used herein are the property of their respective owners. For more information about The California Sustainability Alliance, visit www.sustainca.org.

About Thomas Properties Group
Thomas Properties Group, Inc., based in Los Angeles, is a full-service real estate company that owns, acquires, develops and manages office, retail and multi-family properties throughout the United States. The company’s primary areas of focus are the acquisition and ownership of premier properties, both on a consolidated basis and through its strategic joint ventures, property development and redevelopment, and property management activities. Since its founding in 1996, Thomas Properties Group has developed, restructured and acquired properties in the West Coast, Southwest and Mid-Atlantic regions of the United States. For more information about the Thomas Properties Group, Inc., visit www.tpgre.com.

Forward Looking Statements
Statements made in this press release that are not historical may contain forward-looking statements. Although Thomas Properties Group believes the expectations reflected in any forward-looking statements are based on reasonable assumptions, these statements are subject to numerous risks and uncertainties. Factors that could cause actual results to differ materially from Thomas Properties Group's expectations include actual and perceived trends in various national and economic conditions that affect global and regional markets for commercial real estate services, including interest rates, the availability of credit to finance commercial real estate transactions, and the impact of tax laws affecting real estate. For a discussion of some of the factors that may cause our results to differ from management's expectations, see the information under the captions "Risk Factors" and "Management's Discussion and Analysis of Financial Condition and Results of Operations - Factors That May Influence Future Results of Operations" in our 10-K for the year ended December 31, 2007, and contained in our reports on Form 10-Q for fiscal quarters during 2008, which have been filed with the SEC. Thomas Properties Group disclaims any intention or obligation to update or revise any forward-looking statements, whether as a result of new information, future events or otherwise.

SOURCE: Navigant Consulting