This issue recently came up - when buying a house, condo, etc. with an empty space of land next to it, does the guy who owns the ajacent land have the right to block your windows?
Simple answer - he can build whatever he wants on his land. So anyone can block your windows - you don't have the right to light, air, etc. Pretty scary.
P.S. to the best of my knowledge, there are no zoning laws against blocking neighbors' windows.
New York State 2014 Elections
4 months ago