i ran the map, and there are some probs
you didnt have sky texture, it turned up purple/black checkers(read
sky tut)
there was no light so it turned up fullbright(try putting up some streetlight along the wall and in the middle, that'll look cool
)
some minor were that the doors were ugly textured, those stairs in the beginning are PROBABLY causing some error, i dunno.
and there was a whole lot "solid entity emty" errors.