Ukrainian Institute of America, ca. 1975.

The Fletcher-Sinclair mansion (now the Ukrainian Institute of America) was built in 1897 and designed by the well-known architect Charles Pierrepont Henry Gilbert. The French Gothic mansion was constructed as a single family home for Isaac D. Fletcher, a banker and railroad investor. The building is elaborately designed with drip moldings, gargoyles, and a high mansard slate roof, though the narrow side (5th Avenue) facade is a bit plainer to blend in better with the neighboring buildings.

The home, along with Fletcher's extensive art collection, was donated to the Metropolitan Museum of Art after his death in 1917. The museum turned around and sold the home to endow the prints and drawing collections. The buyer of the home was Harry Ford Sinclair, founder of the country's largest independent oil company. He would end up in jail for jury tampering related to the Teapot Dome scandal and sold the home in 1930.

After one more private owner (supposed descendants of Peter Stuyvesant), the house was purchased in 1955 by The Ukrainian Institute of America, a new non-profit (started as a small organization on Long Island in 1948). The Institute is dedicated to promoting the art, music and literature of Ukraine and the Ukrainian diaspora. Since 1955, they have thoughtfully and professionally maintained and preserved both the interior and exterior of the building