Alloy's One John Street is set to put its largest penthouse, PHE, on the market today for $8.8 million, The Real Deal reports. If the 3,600-square-foot, 27-window apartment sells for the full asking price (or close to it) it will become the most expensive condo to ever sell in Brooklyn, according to a Streeteasy search, topping unit no. 14 in Dumbo's Clocktower, which fetched $7 million in 2008. There is competition, though: the Clocktower's penthouse is currently on the market for $18 million, and has been since 2013. (Prior to that it was asking $25 million.) There's also a unit in the Pierhouse asking $10.49 million, and the penthouse in One Brooklyn Bridge Park, which was listed back in May for $32 million and was mysteriously delisted four days ago.