When I lived in Phoenix there were several gyms that I ran across that were run out of houses, garages, even a corner of a construction companies warehouse. It may work in your favor in terms of individual attention from your trainer because in many gyms there will be 40 boxers and only 3 trainers on a given day. He probably knows people at other gyms so it can be good for sparring as well, if you get the chance to work with guys at several gyms instead of the same 2 or 3 all the time.