New York Cotton Exchange Building, 1923.

Completed in 1923, the Cotton Exchange Building was a new kind of commodities facility. Architect Donn Barber placed the trading floor at the top of the building, instead of on the ground floor, as was most common. The trading floor sat under a large skylight, surrounded on all sides by three-story windows. This building was the first major building in the Financial District to undergo residential conversion. It has been a co-op since 1985.