I was simply explaining the hazards of buying or renting property where you need those companies supplying renters and cities allowing it, to avoid going bankrupt. 

Most important thing to look at is population growth, employement diversity & growth, and supply constraints. 

the cost for the hvac and homes would be $60,000. that's 3 houses and 3 central heat and air units, $119,000 is still left. the cost of supplies was handled by my would have been investor so I am ignorant on that information.

I never paid my bills oaid for repairs or purchased supplies with appreciation 

For example, when my parents had a very long term renters who had financial difficulty, my parents supplied them with food for a month, but they had to pay the rent. 

A modern mobile home looks like Class A apartment finish-out, while a 1980s may be depressing.4) How much supply does the market have?

Any suggestions on rewards (other than just reimbursing them for supplies)?

Of course you will want to assess supply and demand in the market and you will lose roughly 20-25% of your square footage to common areas/hallways.Mike

There is more demand than supply and new construction isn't keeping up.

Supply and demand heavily favors the solid GC in the current market; my retirement age GC father in law says that he's raised his retail first time customer rates 20% per year for the last 4 years and, in his words, "no one has even blinked."