Tonight, I watched an egg roll out of a nest still under construction at the San Remo's north tower at 75th and Central Park West. This pair was seen all winter on both the San Remo and the Beresford, and seemed to be having troubles choosing which ledge to use for their nest. For awhile they seemed to be bringing twigs to every ledge!
(The video may make it look like the female pushed the egg out of the nest. However, I think it rolled out on its own after she first saved it from rolling out. I suspect the ledge isn't level to ensure that rain water runs away from the building.)