Even meals and entertainment with business partners and clients are potentially a tax write-off if you discuss business...see disclaimer above.

He could very well spend thousands of dollars in legal fees, spend numerous hours of personal time working on it or bust the guys kneecaps and he will still end up in the same place No money.........although the knee caps might get him a free orange jumpsuit and 3 meals a day

As Ramon mentioned, the stretch of Villard around 35th has a little business district that at least from driving through, seems to have some life to it and its not just all dollar stores and whatever other national junk chains, its got a lot of what look like locally owned, unique small businesses.

It is a fallacy to believe that an LLC makes your personal ownership invisible.Any preliminary title search will show the chain of ownership.

I do not see an issue with it being illegal (from whomever would enforce), I shared section 8 experience to give their stance on it from a safety standpoint.If your tenant is worried about it, there are a lot of inexpensive items to consider as simple as a door chain to alarm devices that will connect to wifi, that can be armed remotely. 

I was thinking that if I did end up going the route of the individual heaters that I would somehow chain them all to 1 thermostat.

Not a landlord but I work with government grants on low income, in CA there are a lot of programs that nobody really know about, all they need is ask housing authority and it will trigger a chain reaction if they qualify. it is a pain on paperwork at first but same requirement is asked if they qualify on one program and apply for another.

The material costs, supply chain issues and labor shortages are still big issues in the building industry right now.  

It's impossible to know without the purchase contract, and knowing the actual chain of events, which you may not know.

Each legal entity needs to be isolated one from the other, except in the chain of the Manager.