All the rooms should have their own locks.

Another option is asking the tenants if they'd like their locks replaced and giving them the option to keep their current locks if they prefer.

Your post sparked a question - is there a legal requirement to change out locks on turnover to protect the tenant, or is this simply a 'best practice'?

Maybe there are write offs for each of you.And lastly...Locking it up!

Then lock them into a contract.

Then you'll be able to get all your cash back and lock in the best rates on your permanent financing.I have two contacts around here that will do 10% down @ 10% interest.

Also, I would switch out the locks on the doorknobs so people can’t accidentally lock themselves out.

., Don’t skimp on the lock, use a contractor grade lock, if possible, get the lock installed on the inside of the cage (no room for bolt cutters to open), and make multiple copies of the key. 

I don't see how they could fight it if you took the vehicles if they didn't pay but without keys you would need to hire a repo company or tow company to take them, bring them to a mechanic and have the keys made or locks swapped depending on the year and make.

Give him a key to the property or have the property manager set him up on a lock box.My property manager would do a lot to help me out.