Just because something is written in a way that sounds official, doesn't make it legal.And....to make a long story longer....just because the plumber says a tenant signature means the PM or owner has to pay whatever he writes on the invoice - doesn't make it legal or binding. 

It still puts me in a bind with a lot I can't rent and I am sure that soon the village will be complaining about an abandoned mobile home.

You don’t ask the fat guy for fitness advice and you don’t ask the ford salesman for Chevy advice.

I really wish that you can maybe replace their A/C to a new one but you have a big fat wall in front of you.

Verbal agreements are legally binding, but you'll need a paper trail (payments/receipts) for proof.

Although you currently have a binding agreement with them which begins July 1, 2016, don't try to hold them to it.

Are there any signs of foundation issues visible from the inside (doors that don't close correctly, windows that bind, cracks at window/door openings, etc)? 

Whenever recessions happen businesses use it as a way to trim the fat and get more efficient and I imagine that will happen this time around also. 

They accepted our lower offer which gives us a pretty fat buffer.

Sounds like a big old fat DELETE to me.