You have no idea if they paid rent since March 2020, if they have income, what prior agreements exist. 

Use it to payoff mortgage on existing rentals?

We have done a few direct deals for existing clients.

Take into consideration any existing exemptions….homestead, disabled, etc. 

However, this presumption does not apply if the rent is current or the tenant has notified the landlord, in writing, of an intended absence; orWhen the last remaining tenant of a dwelling unit is deceased, personal property remains on the premises, rent is unpaid, at least 60 days have elapsed following the date of death, and the landlord has not been notified in writing of the existence of a probate estate or of the name and address of a personal representativeness.”So is it 30 days or 60?

I’m adding a kitchen and full bath to an existing house I rehabbed in 2019.

This would be to purchase an existing home.

I never had even an existing tenant complain when I removed disposers, dishwashers and swimming pools.

Starting a campground is another speculative, expensive, time-consuming, and risky business that requires 14/7 management and most existing campgrounds are nearly empty since starting about 30 years ago when kids started getting all the new electronic games and other crap a high percent of families don't go to the forests and campground like they used to.Your ideas have too many 'IFS' and to many risks.

Once our lease expires or cycles, when we increase rent, we do so through a simple, one page addendum to the existing lease.