Tribeca’s Hubert Street is a little hotbed of new residential development, and one project has officially hit the open market. 15 Hubert Street, a landmarked building from 1867 also known as 407 Greenwich Street, is being converted by CetraRuddy into 12 two-bedroom apartments. Loft-y in design, with exposed brick painted white, concrete accents, and “industrial lighting,” there are onlythree units per floor, ranging from 2,269 square feet to 3,075 square feet, as well as a common roof deck. Completion is slated for early 2016. The building is actually 67 percent, or two-thirds, sold already, and developer Samson Management just listed the four remaining units—one second-floor apartment and three penthouses. The latter have private outdoor space.