The top floor of this building (located on E76th next to a NY Sports Club) is one of those rooftop additions.
It has no relevant connection to the rest of the structure, but it looks like a box superimposed atop the fifth story.
Divergent in style from the original, it offers the tenants at the top little balconies.
Today was the first time I made any note of this building’s changed status. You, no doubt, don’t find that fact as interesting as I do.
Walk with Me, Too 