Sometimes you get those unfamiliar mission areas.
The door is probably in the adjoining building.
That sucks!
Looks like you're going to have to redo that mish.
/edit
/ccr that, and if you have the map co ordinates, that will help the devs see where the building is. They may take it out of the building rotation for missions.
I fairly certain that I have already reported this bug. If I am right, the room location is just on the edge of Moriah and Tabor Park, the corner building. I think it's an archive mission that causes the bug and I had the same problem happen to me on 3 consecutive times.