The old 30th street post office at night.—via Halkin Photography, LLC. One of the largest real estate companies in the country is about to start enter the New Year with a bang as Randor based Brandywine Realty Trust has sold Cira Square, the building at 30th Street in the University City neighborhood of Philadelphia that used to be a U.S. Postal Service building, for $354 million. The 862,700 square foot building will be valued at $410 per square feet when the transaction is finalized, which is expected to take place in the first quarter of next year. Currently fully leased to the General Services Administration, the property is the base for close to 5,000 employees of the Internal Revenue Service, which has a 20 year lease for the offices. Brandywine Realty Trust has indicated that the prospective buyer is a fund managed by KIM Investment Funds.