P.S. 135, also known as P.S. 35, is a historic school building located at 931 First Avenue at East 51st Street in the Turtle Bay neighborhood of Manhattan, New York City. It was built in 1892 on the site of "Mount Pleasant", the estate of James Beekman. The school was designed by George W. Debevoise in the Romanesque revival style., and has been at various times a community center, a homeless shelter and a nursery school, as well as the United Nations International School. There was an addition made to the building in 1904.