Because the original value of your closed loan was based on renovations being done, there is no additional value to use for the removal of the PMI.Maybe consider refi to another lender who will order another AVM or appraisal to get you a more desirable LTV. 

I would be happy to help you look at your deal and anything else related if you like. 

Is there a clause in the contract that ties you to him after the 7 days?

You either do it or remind tenants to do it and even then you would have to check they actually do it. 

Assignment of mortgage which has to be recorded.

As I spoke to an expert who invests all over the US in sober living, he told me the best way was to find treatment centers nearby the area you want to invest.

For insurance, I’d recommend working with a local broker to explore the best rates.

It specifically calls out stays of less than 7 days, though.

I plan to raze a house I own in SD county and build a quadplex on this one parcel. 

If you're still wanting to do it - lowest cost of entry I could think of getting yourself a list of a few thousand properties and then hammering through them for hours a day until you find someone interested.