This duplex in the sky is retailing for a cool $7,200,000. The 3-BR, 2.5-BA has all the pizazz one would expect of a luxury condo in Back Bay—with one catch.
Its 3,500 interior square feet are matched by an identical amount outside. To breathe in this arboreal splendor, the duplex's floorplan is laid out in such a way as to provide a door or a window onto the terraces, oh, about every four feet or so. Indeed, windows seem to run three sides of the first floor and all four of the second, rendering it a de facto greenhouse, perhaps Boston's highest.
· Listing: 221 Columbus Avenue, #800 [Otis & Ahearn]