I am going to reach out to the company who did the plans to get a better understanding. 

I own a property management company in Vegas.

Any good AI companies that generate motivated seller leads?  

It tested low: Highest levels are .3, well below the 1.5 legal limit for contamination.However, it’s been suggested that I still might want to hire a remediation company to do HEPA-vac + wet wipe throughout the home.

We just met with two pro cleaning companies and had the opportunity to try one out so far.

This is not going to be the most "ideal" scenario that you would prefer, but the alternative would be to go through the lengthy process in housing court which may not guarantee any solution. 

Have you interviewed property management companies?

Bian- I co-own a HOA management company that specifically works with smaller buildings. 

There are several National Insurance companies that could easily handle 1.6M. 

Call up all the title companies in the area and see what they have to say.