I live in and own three properties in Broward county; SF and duplexes (STR). 

My plan is to househack by staying in one unit and rest out other three.

I guess I have to find root cause first.If you are checking with a mold "expert" I would suggest checking with at least three and ask them questions based on what the first one says. 

After lawsuit, the properties are handled by receivership that's handled by SEC.Now after three years of selling all asset, guess what, all investors are receiving 95% of their money back.

The IRS has issued three (3) Private Letter Rulings that specifically allowed these types of transactions, but you are certainly right about the time, money, risk and cost prohibitive in many cases. 

I'm considering purchasing a triplex where two of the units share an electric meter and all three units share a water meter.

Normally at minimum an appraisal is required to verify the remaining collateral is sufficient.

They looked at dozens (maybe he said over 100) deals and only three penciled.  

I’ve always believed that if the lender is a “partner” sharing exposure and not an at cost money provider dividing the profit of the deal into three sections is appropriate   MoneyMarketingManagement This said it’s not unreasonable to allow a minimum return after “X” profit.  

This move comes after a strategic review, three years after the merger of the two companies.