 In 2005, the company completed the development of the Cira Centre, designed by César Pelli, next to Philadelphia's 30th Street Station.In 2006, the company acquired Prentiss Properties Trust for $3.3 billion.In 2010, the company completed the renovation of Cira Square, a former U.S. post office building that was leased to the General Services Administration for occupancy by the Internal Revenue Service.