I do property management and am often in similar situations as you describe. I would definately follow the advise of others here and take another self defense class. Curious as to why you can't carry pepper spray or it's equivalent? I had my whole office take a self defense class here locally given by an ex-swat guy, it was very good...no fluff, very straightforward. He also uses a rope on his keys... It is attached to your keys and is long enough to hook on your wrist and still have 6+ inches of swing, which makes a decent unconventional weapon. It was nice to have the training though!