The Cira Centre South parking garage provides 2400 parking spaces with 1600 reserved for employees of the 30th Street IRS Facility, as well as an additional 11,000 sf of retail space. In addition to the parking garage, the Post Office Annex development, as presented in a preliminary design by Brandywine Realty Trust (BRT), proposed two mixed-use towers fronting on Walnut and Chestnut Streets. The Walnut Street Tower will offer 500,000 sf of office space, with Penn leasing 115,000 sf; 12,000 sf of retail and restaurant space; 200,000 sf, 225 room Hotel; and a 125,000 sf, 50 unit condominiums. The Chestnut Street Tower will provide 300,000 sf of apartments and 7,000 sf of possible retail along Chestnut Street.