Scam.

I got a sheet of paper shoved under my door the other day. It said my building had been sold. It had an address and company name for me to send my rent to in the future. I thought about what a great scam this could be. Get into a building, slip a bunch of papers under peoples doors telling them to send you their rent....
I looked up the company. They exist. The next day, a guy from the management company came by, asked if I needed any repairs, a smoke detector, checked for leaks. I hid the syringes I use to refill ink cartridges. Hard to explain those to strangers.