Crap in the yard, part 2

Here we have a strange plan for 53-51 63rd Street, Maspeth. A one-family duplex is being constructed in someone's side yard.
Plans for a garage on the premises were disapproved by the buildings department, which raises the question as to what the structure in the far left of the pictures is if not a garage.
Here's the original house, with its bars on the windows and gaudy balcony.

See also: Crap in the yard, part 1