The beautiful Italianate Haughwout Building on Broadway at Broome Street in SoHo. It was built in 1857, designed by architect John Gaynor who was inspired by the San Sorvino Library located on the Piazetta in Venice. Robert Moses threatened to demolish it for his proposed Lower Manhattan Highway in the 1960's. Thankfully preservationist rallied to save this cast iron gem so it can be admired today.
Corcoran Real Estate, one of the largest real estate firms in the city currently occupy the building.