Reverse of photo reads: "This block of old dwellings and small shops was demolished for new clinical [?] building. Set [?] on west side of Madison Ave, from 99th St. (left) to 100th St. On left, hospital's central laboratory building opened in 1953."
Mount Sinai's Atran laboratory building is on the far left. The buildings in the center were torn down in 1959 to make way for the Klingenstein Clinical Center. Note that Madison Avenue was still a two way street at this time. Also visible next to the tenement on 99th Street is the Employee dormitory and the shorter Lewisohn Laboratory Building next to it.