 In March 1999, Chicago-based developer the Barton Group announced its plan to build a 37-story, 322-unit luxury residential tower.The Barton Group's plan would also incorporate the PSFS headquarters building and York Row into the tower.At the end of the 1990s, Philadelphia was experiencing a condominium boom, with more than 70 Center City office and manufacturing buildings being converted into rental and condominium apartments between 1998 and 2004.