Brandywine to Construct Office Building at Premier Dulles Corner Office Park in Herndon, VA; When Completed, South Lake at Dulles Corner Will Expand Brandywine's Northern Virginia Portfolio to More Than Three Million SF of Space.

PLYMOUTH MEETING, Pa. -- Brandywine Realty Trust (NYSE: BDN) has announced it will develop South Lake at Dulles Corner--a 267,350-square-foot, 10-story speculative office building in Herndon, Virginia. South Lake will be Brandywine's fourth building at the award-winning Dulles Corner suburban office park, bringing their Northern Virginia ownership position to more than three million square feet. The anticipated completion of South Lake is in the third quarter of 2007.

Bob Wiberg, executive vice president and managing director of operations, Brandywine Realty Trust, commented, "We continue to see strong demand for office space within our core Northern Virginia portfolio with vacancies in the single digits. South Lake at Dulles Corner will fill a market void for the highest quality office product in a unique business environment, and is well positioned to accommodate the current and future space requirements of tenants in this dynamic marketplace. Brandywine is proud to maintain our market leadership position in the Dulles Toll Road corridor with the start of this new world-class office building situated in one of the most desirable office markets in the country."

Located at 13820 Sunrise Valley Drive, the 10-story, 267,350-square-foot state-of-the-art South Lake office building will feature an adjacent four-level parking structure, as well as striking architecture by the firm Noritake Associates. The building will offer nearly column-free floor plates with 9' ceilings, an upscale lobby finished with wood and glass accents and a slate floor, and an efficient core design. South Lake affords additional growth and expansion within the office park on adjacent sites, with more than 500,000 additional square feet planned and ready-to-build.

South Lake at Dulles Corner is a part of the Dulles Corner office park, which consists of approximately two million square feet of Class A master-planned office and hotel space. Dulles Corner has garnered numerous awards highlighting its distinctive architecture and landscaping. Situated at the intersection of Route 28 and the Dulles Toll Road, directly adjacent to Dulles Airport, South Lake offers a pedestrian-friendly environment with outdoor seating, walking paths, views of the Blue Ridge Mountains and a lakeside environment. Amenities in the area include restaurants, the Hyatt Hotel, valet and daycare. Key tenants in the Dulles Corner park include Northrop Grumman, Radian, Perot Systems, AT&T, Nortel and Deltek Systems.

About Brandywine Realty Trust

Brandywine Realty Trust (NYSE: BDN), with headquarters in Plymouth Meeting, Pa., is one of the largest full-service, completely integrated real estate companies in the United States. Organized as a real estate investment trust (REIT), Brandywine owns, manages or has ownership interest in office and industrial properties aggregating 46 million square feet.

For more information, visit Brandywine's website at www.brandywinerealty.com.