Last summer, Mayor Michael Bloomberg unveiled a plan to build the city’s first “microapartment” building: 55 rental units, all ranging between 250- to 370-square-feet, a size that was, until recently, illegal under current building code. Bloomberg held an open call for proposals for the fun-sized dwellings, and announced the winning design Tuesday morning.

A project called My Micro NY from a design team comprised of Monadnock Development, Actors Fund Housing Development Corp. and nArchitects beat out 33 other proposals to win the competition.

Construction at 335 East 27th Street will start by the end of this year, with move-ins slated for September 2015. In addition to being downright tiny, the building will be the first multi-family building in Manhattan to use prefab construction. The shipping container-esque prefab modules, which will be manufactured by Capsys at its Brooklyn Navy Yard factory, will snap together to form the building.