construction

i know i should be immune to all of the ugly/shoddy buildings going up in our neighborhood, but this latest one intrigues me:

it's on greene avenue, between grand ave. and classon ave., closer to classon, on the south side of the street.

it caught my interest because it looks like it might not be residential. and what exactly is going on with the opening (window?) on the bottom right? it looks like it spans two floors...

...but what would be the purpose of that? and if it's not residential, what is it?

anybody know anything about this?

(UPDATE: The following photos are from commenter David6of7, taken on his block on Waverly showing very similar construction:)