I lived in Jackson Heights through most of the 1960s and I also remember Toy City being on 37th Avenue, and between 75th and 76th Street sounds about right. I also remember the Greenglass store on the west side of 74th Street, between 37th and Roosevelt Avenue. When I grew a bit older, one of my favorite hangouts, as it were, was Center Cycle on Roosevelt Avenue. In addition to bicycles, they had a great selection of chemistry set supplies.