This has been the most successful model I have seen in real estate.This goes 100% against every guru and investor the past 5 years of get rich quick of buy, rehab, rent and refinance with little money - that video game is out of order so the gurus need to reinvest themselves and they are trying with seller financing and zero down.

Since the last time I was online, I have grown the investing to fix and flipping and a portfolio of 4 properties that are producing passive income.  

Monitoring open windows isn't feasible in my case, but I can definitely monitor daily electricity usage online  

Dig deep for online reviews, Better Business Bureau and their State Real Estate Board, etc.- Do be open-minded though as we have many of the above from tenants who claim we illegally evicted them (so, somehow we got a signed Write illegally?)

A national buyer would review the BPO and maybe do some brief online research, but would not typically not know, as in your example, about the sewage issues or extent of interior rehab needed.

There are also many online calculators you can use if you do a search for them.

Go to courthouse in city where your rental is, or see if docket is available online, and write down the names of the attorneys with the most landlord-tenant cases.

I personally focus on DSCR investment loans and creative investment financing strategies, so I am happy to connect with you and talk about a game plan.

I would get back to local real estate investor meetups so you can connect with locals to the area and kind of get back in the game slowly that way.

I'm presently a facilities engineer by trade, who does some construction and maintenance for landlords on the side, hoping to get back into the private real estate game.