OK, let's get serious....
Looking closely at those "windows", looks like it's slightly arched. It's rather large, as we only see about half the arch. The yellow "seeing impaired bumps" on the pavement suggest a "public" area such as a train/subway station. The opening is quite wide.
Not that we haven't figured all that out already.
Nothing like beating a "dead horse".
BTW: what's up with that guy in the red jumpsuit with a "hoover" strapped to his back?