Interestingly aardvark2zz's 314 m diameter from Roosevelt Island seems to intersect with the building
Google map for 72nd Street and York Avenue, new york, ny and proceeding towards the east River shows the red-brick tower that got hit. It's flanked by a white building to the East and a yellow building to the West that match up with the pictures in the NY Times.
There are two towers just to the North so that if you fly through the gap between them you are lined up with the accident site
Just to the North the buildings seem considerably lower, though I do not know how close that is to the LaGuardia CZ.