Part of what you are describing is what they call an installment land contract.

@Jamie BanksI understand there are multiple parties: 1) displaced insurance policy holder (tenants)  2) ALE 3) The company that supplies all the furniture and install the washer and dryer. 

His opinion is that we don't need to install piers right now, but we should focus on making sure water doesn't flow towards the house from the outside. 

Quote from @Gregory Chadwell: I wonder if having a lead filter installed on the property might help the situation too? 

Turn on faucets, showers, look at how the toilets are installed, are they wobbly, EVERYTHING.

Use LVP flooring, it's cheaper than installing new hard wood floors and they're more durable for longevity purposes.

Because the existing house was too low the developer followed the rough location of the old sewer line and installed a new sewer line to connect to the existing house. 

I would like to branch into commercial leasing with a government client niche (solar farm land and datacenter leasing too).

I'm a fan of gated yards and higher-end security doors and will install chain link and even some wood privacy fencing if I think the house/area warrants it.  

And there are a couple of folks in town who are suggesting using installment contracts as workaround, as well.