Built by the son of a robber baron, the 15-story co-op building at 160 East 72nd Street has a fascinating history, and arguably the most historic of its residences is now on the marketor at least a piece of it is. Kingdon Gould, son of the vilified Jay Gould, a multimillionaire who made his fortunes by manipulating railroad stocks (he has been deemed "the 8th worst American CEO of all time"), developed the apartment house and created for his family a 20-room triplex penthouse. It had a double-height music room, multiple terraces, a 32-foot-long living room, and a squash-tennis court, which is where this for-sale penthouse is located. The home, asking $7.25 million, is still technically a triplex, but with only one room on each adjacent level. The listing says the place needs some TLC, but it comes with a huge terrace, multiple wood-burning fireplaces, and a solarium.