Use a lock on the door that can be accessed with a code.

@Kirk FrickeyHey Kirk,Vinyl flooring is the hot seller in today’s market for a variety of reasons, the Main being the flexibility of design allowing you to have modern looking flooring for a fraction of the cost of traditional materials, the second being ease of installation - particularly with click lock mechanisms.

And, by making the connection and demonstrating respect for their property rights, you'll pick-up some eyes and ears to watch over your investment until it sells.  

I've also replaced all locks in the house and brought in a dehumidifier for the basement ("something extra" Chris alluded to)  I'm not sure I like the "open-endedness" of "what can I do to make it right" but I hope the gesture of one month's concession along with completed renovation pictures shows I'm indeed, trying to make it right. 

Turnover to a realtorStarted direct mail, just want to make sure I'm locked and loaded with options to best serve the homeowner.Thank you!

Interest rates are pretty low right now so you may want to refi and lock in if that works for cash flow.

I'd suggest getting a general pre-approval regardless so you're not scrambling when you do lock something down. 

I would just lock the door and forget about the unit...make it a storage room...save the 20k....the 24 unit apartment just became a 23 unit apartment.

Use grounded three prong surge protectors; Extension cords, plug adaptors and halogen lamps/bulbs are prohibited.Use microwaves, crockpots, toaster ovens, coffee pots, hot plates and other cooking equipment ONLY in the kitchen and not in the bedrooms or sleeping areas.Not permit the use of the laundry machines for any person that is not a Tenant.Shall not bring bicycles into the interior of the Premises (other than the basement).Tenant shall not hold, conduct or throw any large parties in the Premises.Replace batteries in smoke and carbon monoxide detectors alarms, a smoke alarm or carbon monoxide detector without a working battery will result in a fifty-dollar ($50) penalty for each infraction.Change out any broken or defective lightbulbsAllow Landlord to use Wi-Fi (if applicable) and electric to power smart home devices (if applicable) i.e. smart locks and thermostats.

Music to you ears.