Hiring a certified mold restoration company (can be $$) sometimes is needed as some buyers want the assurance that the mold was remediated properly.

If they trash your unit you have judicial remedies even if you are required to return the security deposit but it will take time, money, and you will probably never recover damages from people who would do that type of thing.

He stated that OP is not working up to his expectations and let many of his investors down, in order to remedy the situation he proposed my property transfered to Blue Sky - his own management company assuring me that he will finish the renovation and rent it out.Kate Federico from Blue Sky took over in April 2018 - after few days she reported that the property is 70% completed.

I am 61 years old and I have been bedridden for a few years ago from a brain annurism and a stroke just 2 days before I was scheduled preventive surgery. 

There was some remediation in the basement  that had to be done which I had my guy step in and do.

After done renovations / repairs / maintenance on many many properties, I kind of know the price range of each job like painting, flooring, drywall, plumbing, electrical, AC, pest control, remove odor from old pet urine, mold remediation, cabinets, countertop, backsplash, appliances etc etc in my mind.

You would have to find neighbors who they spoke with about the issue that are willing to go on record or find a company that they may have used to try to remedy the situation.Outside of that, you really don't have much recourse.

Hired a General Inspector which lead to a Plumbing Inspector and Termite Inspector with Remediation.

Who really cares, so long as it gets properly remedied. 

Purchase is 300kProblem is that they need asbestos remediation.