18-20 West 89th Street Dennison, Hirons & Darbyshire | BrickIronworkStone | Upper West Side - Central Park West HD | West 89th Street | Early 20th-Century Functional | School | 18-20 West 89th Street 18 W 89 d 18 West 89th Street A 18 W 89 b 18-20 West 89th Street 18-20 West 89th Street Date: 1912 NB Number: NB 400-1912 Type: School Architect: Dennison, Hirons & Darbyshire Developer/Owner/Builder: Koenig Realty Co. NYC Landmarks...