Thanks to all of you for responding so quickly! Receiving help from learned sources is so valuable and I appreciate it.
I figured that his previous violent history and repeated criminal trespass citations would be enough to show why I'm afraid that he would resort to violence if he were to...
My mother owned a zoned live/work building for 10 years. It remained unleased for the entirety of her ownership, and was registered with the tax assessors office as a storage/warehouse space. There were no utilities turned on for the property, as it was not my mother's intention to rent it...