At first the square, the last public space that functioned as the entrance to New York City, was largely residential: the Union League Club first occupied a house loaned for the purpose by Henry G. Marquand at the corner of 17th Street and Broadway. After the Civil War the neighborhood became largely commercial, and the square began to lose social cachet at the turn of the twentieth century, with many of the old mansions being demolished. Tiffany & Co., which had moved to the square from Broadway and Broome Street in 1870, left its premises on 15th Street to move uptown to 37th Street in 1905; the silversmiths Gorham Company moved up from 19th Street in 1906. The last of the neighborhood's free-standing private mansions, Peter Goelet's at the northeast corner of 19th Street, made way for a commercial building in 1897.