Be careful! Once, I told the two tenants of a two family I would be increasing the rent to FMV. The seller also informed his tenants that their rents were sure to increase and they would have to sign leases.
I got a call from the guy in the first floor apartment, asking if I would come over and discuss a new lease. i went to see him and he let me in the apartment. Three of his friends were waiting for me in the living room. i am sure I was due a beat down or at least the threat of one. Luckily, I was thinking fast and made a move before any of them could do anything. The tenant, who was between me and the front door, got thrown out of my way and out the front door I scrambled! After I got home, the tenant called and apologized and agreed to leave the apartment rather than have me file a police report. He did some damage (minor stuff) to the unit before he left. But, I was just happy he was gone and I didn't have to visit the hospital.
Since that day, I am always armed when I deal with a REI situation like that. I have a concealed permit, so no one ever sees my weapon and luckily, I haven't had to use it. But, I will never get caught unaware again.