Oops, someone didn’t fill in the old Union Quarry well enough and the houses have all settled! And now they’re being torn down one at a time. Essex Court, as it was called, was a common occurrence after the quarries were closed after World War II. Unfortunately, they’re now collapsing.
Here you can see it on the Sanborns. In an extremely rare instance, there is a mistake on this map: Marcus and Shreve are labeled backwards. Since the entire subdivision appears in Google Street View as of November 2015, the demolitions must be recent. Looks like it was just a stone quarry, judging from this map.