Bart Blatstein Purchases Famed Rittenhouse Square Mansion Just as the Philadelphia Real Estate market is kicking into high gear, Philly.com is reporting that Developer Bart Blatstein purchased the famed McIlhenny mansion, located at 1914-16 Rittenhouse Square, for $4,200,000 from drug heir Henry McNeil . Henry Plumer McIlhenny, was an American collector of art and antiques, world traveler, socialite, philanthropist and […]