Alyssa Katz

One donor gobbled the Lower East Side nursing home where apparently clueless city administrators lifted a deed restriction based on the buyer’s pinky promise to keep it a health facility — then flipped it for condominiums.

Another blotted out the Upper East Side sky with a luxury tower many stories taller than zoning allows because the Department of Buildings got outfoxed by a wily developer who bent the rules.

Both of those fails came to light only because community boards and City Council members Margaret Chin and Ben Kallos sprang into action at the behest of constituents who had gotten the cold shoulder from the mayor’s side of City Hall.