Prospect-Lefferts Gardens is a neighborhood in the northern section of Flatbush. The area was originally founded by a Dutch family in 1660. In 1893 the Lefferts estate was divided by James Lefferts into 600 building lots, now known as Lefferts Manor. In order to ensure that the neighborhood would contain homes of a substantial nature, Lefferts attached land-use deed restrictions, dictating that each lot contain a single family residence built of brick or stone at least two stories in height. The land-use covenant still exists in Lefferts Manor. Houses in Lefferts Manor were mostly constructed during the late 19th Century, the last of which were constructed in the late 1950's. Lefferts Manor and parts of Lefferts Avenue and Sterling Street, not in the single-family covenant, were granted landmark status by the New York City Landmarks Preservation Commission in 1979. Other areas of Prospect Lefferts Gardens contain a mixture of single-family and multi-family homes as well as larger apartment houses.