Landlord advice please.

[Chris Walsh]

Hello Bigger Pockets,

 I really recently purchased a duplex to "house hack".  I am in the process of renovating the side that I am currently living in. I inherited some tenants. The tenants are OK. They pay on time.   They are a little messy but nothing crazy.  I recently totally remodeled the garage and put an electric overhead door. The garage was falling down when I bought the property. The pad was totally wrecked and the garage doors would not close because the tracks were so badly damaged.  The garage backs up to an alley that has a few shady characters. I have asked the tenants twice now to keep the overhead door closed at all times.  All that is required to close the door is pushing a button. I woke up to go to work this morning and the door was open again. I have a few ladders in there and a nice car.  Their car was actually broken into while parked in the garage before I purchased the property.  

I don't think it's unreasonable to push a button and close the door when you leave.  How would you savvy landlords handle this?  Is giving an ultimatum of no longer being able to use the garage and effective way to handle this?  Any thoughts would be appreciated.

Thanks