Maybe they could use the mount that comes with the TV and set it on the mantle vs. the wall mounted one they have to pay for and then have professionally mounted and repaired when they leave in 9 months. 

We have a 3-story apartment building and are having major water (rain) intrusion issues along the back wall of the building.

There are lockable thermostats for commercial use, but I can't see that working in a rental.I think the main issue will always be that any thermostat that you can set a minimum temperature in will always be susceptible to this fail safe failing, due to the possibility the tenant could change it on purpose or on accident.I'd hope in a 4 plex as long as there is no building defect to the thermal envelope that it would be difficult for one units pipes to freeze as long as the other units were occupied, seeing as they share some common walls/ceilings.

Have an "instagrammable space" like a mural on the wall with your hashtag prominently displayed. 

I’ve seen holes burned through walls due to a crimp connection within the wall made improperly by a qualified electrician.

You finish to the walls and the new owner will happily complete their home to their taste.

The walls are thin and my oldest son can hear them arguing every day.

Along those lines, perhaps you should consider changing your profile name from Real Estate to Block Wall, it would be more representative of you.Your analogy, as Jason pointed out, is ridiculous.

Bob Wall loved to write and was working on the storyline as well as producing an exciting sequel to Enter the Dragon entitled Enter the Phoenix.

For more extensive rehab's like if you're adding walls and stuff like that, it's easiest just to have a contractor or 2 give you a quote.