I think it had been mentioned here before that the EPA office in Philly is seeking new digs. Apparently they've found the space they were looking for and it's a lot less square footage. PBJ reports that the EPA is
leaving 307,847 square feet at 1650 Arch
to take 173,007 square feet at Four Penn Center, a 44% reduction.
EPA to leave 1650 Arch St. in Philadelphia - Philadelphia Business Journal