What would you do with a problem neighbor?

[Lee Zhao]

We purchased a condo past June, and rented it out in July. Within two months, the female tenant reported us the stalking and harassment from the guy of next door, and filed a police report. We terminated the lease. Then we rented it out second time to two guys, thinking that they might not have stalking/harassment issues like the previous one. After two months, the guys reported the similar thread and harassment by the next door neighbor, this time, even more escalating and frightening. By now We all know now this neighbor has mental problems. We wrote to HOA, but we were told that the guy's mother bought the unit for him, and that HOA could not do much with the owner-occupied. When HOA notified the guy about his HOA violations, he threatened he would sue HOA. Our tenants keep telling us how unsafe and uncomfortable they feel each day and may consider terminating the lease. Now we are struck and weighing on what we should do under these ciucumstances. If we terminate the lease second time, we know we cannot rent it out again as long as the guy lives next door. If we have to sell it, what do we have to disclose about our property in this situation?

Any advice or suggestions would be greatly appreciated. Thanks in advance!