At number 19 on our year-end countdown of the tallest buildings under construction in New York is 505 State Street, a 482-foot-tall residential tower in The Alloy Block complex in Downtown Brooklyn. Designed and developed by Alloy Development, the 44-story structure will yield 441 rental units, with 45 reserved for affordable housing, and will be fully powered by electricity. The five-building Alloy Block master plan will comprise a total of 850 units with 200 permanently affordable apartments, 100,000 square feet of Class A office space, 50,000 square feet of retail space, 500 bicycle parking spaces, two Passive House public schools designed by Architecture Research Office, and space for a local cultural institution. Urban Atelier Group is the general contractor for 505 State Street, which was formerly addressed as 100 Flatbush Avenue and is bound by Flatbush Avenue to the northeast, Third Avenue to the northwest, and State Street to the southwest.