When I got home from work late last night, I noticed one on one of the walls in the stairwell, a few flights down. There are not, and have not been, any maggots in my apartment, to the best of my knowledge. Also, no food or garbage left around.
Is it possible that someone else in the building (and quite possibly on my floor) had maggots and the mature flies have simply found their way into my apartment?? And how -- through the door?