217-221 West 57th Street (just East of Broadway)
This 12-story building from 1922 met the wrecking ball just after I left town in 2010. My memories of it were as one of the homes of Broadway Dance Center, where I took a few classes in the 1990s. It was supposedly demolished to make way for a 50-story mixed use tower, although it was just an empty lot when I visited in 2012. The project may have been caught up in a preservation battle over the remnants of Automobile Row, notably the B.F. Goodrich building next door at 225 West 57th.