109 and 111 East 79th Street, date unknown.

An interesting mix of architectural styles, these mirror image mansions were commissioned by a set of sisters. Alice Martin McCoon and Edith Martin hired the firm of Foster, Gade & Graham to design the French Renaissance style homes. The sisters would live in the homes, while also leasing them out while they were traveling abroad. In 1920 Alice leased no. 109 to jeweler Pierre Cartier.

In the 1950s, long after the sisters had passed away and the buildings had changed hands a number of time, they were converted into large apartments. During these alterations, the shared stoop was removed and the entrances were moved below the sidewalk level. Today the original doors have been converted to large, historically anachronistic windows.