Would anyone have some suggestions on a smart lock which would fit this type of door? 

Besides trying the above (i.e. phone calls, facetime, text, whatsapp, pictures, etc) I would suggest you hire someone to be your eyes and ears down in LA. 

Unless both the circuit breaker for the heater and the local disconnect are locked inside an "Authorized Personnel Only" area, the tenant(s) can always shut the heat off.

Until then all you are hearing is BS when someone firmly states my cash flow is ........I know to this point in time I have positive cash flow, some is unfortunately artificial due to locked in equity, but to answer the question as to my actual positive cash flow...…. without a crystal ball it is impossible to answer.I have a friend that has a mortgage free1M dollar property he rents for 5K per month.

When you run a business however, you can write off a lot of materials, equipment, software, etc.. that can help reduce your tax bill.If there is a cheat code to this, I am all ears!! 

It actually sold to someone else within the first few hours, but the deal fell through and the wholesaler reached back out to me a few days later and I locked it up.

Saw a story on a New York Landlord who removed the squatters and changed the locks.

If you are locked in at a three-handle, I would HELOC the equity and use it as a down payment on a new deal.

Rising interest rates have hurt everyone’s buying power (except cash buyers obviously), and inventory is locked up because nobody wants to move and give up their historically-low interest rate.

I'm all ears!