Can someone just kick a disabled person out after 15 years of renting with a good rental history?
These people have been causing problems threatening us with having someone they know buy the building we live in. We have been here 15 years never late with rent, never had police called for fights, and never problems with other neighbors. What can be done?
Unfortunately, when a new person purchases a building, that new owner in most states does not have to renew the existing lease. Threatening to sell the building to a new owner isn't necessarily illegal and it doesn't seem it has actually caused you any quantifiable damage. A lease is different than ownership in this respect. You do not have a legal right to force a landlord to renew your lease. The landlord can choose to not renew your lease, whether or not you pay on time or are model tenants.
If you wish to have the threats stop, try contacting your local consumer protection bureau that handles landlord tenant matters. If you have an existing lease with time still left on it, a landlord cannot terminate that existing lease in retaliation for you calling the consumer protection bureau.