315 Washington Street, 1957. In the years after the Civil War, the streets of Clinton Hill, particularly Washington Avenue and Clinton Street, saw a construction boom of new, lovely, and large brick and brownstone mansions. This brick home at 315 Washington Avenue was likely completed in the late 1860s. In the 1890s, well-known Brooklyn architects Parfitt Brothers designed an additional story and classic French style mansard roof. At some point in the early 20th century the building's use changed from private residence to a clubhouse (it was the Rankin Post No. 10 of the Grand Army of the Republic) before switching back. Today the home is a multi-unit residence.