The penthouse at 46 Lispenard Street just came on the market as a 4BR/4BA rooftop box that sits atop a cast iron beauty built in 1866. The first floor of the duplex penthouse features massive terraces in the front and rear—the whole apartment boasts 2,631 square feet of outdoor space. That may or may not include a third level rooftop whose use is currently pending approval by the attorney general, according to a note on the floor plans. What?! Back inside, the penthouse's second level is reached via a floating staircase, which takes one to the master bedroom, three other bedrooms, and two balconies (looking down on your terrace below, of course). The whole 40 foot-wide apartment is now listing for just under $8 million.