I previously researched solutions for a similar sound problem where I could not open the walls, but I still have not solved the problem.

Similarly, if you put several Class D tenants in a Class A 4-plex, what do you think will happen to the property?

I'm sure there are other similar services out there. 2) DSCR loans would probably be your best bet.

That company, hopefully, manages a lot of similar properties to the one you are investing in.2) I can't speak to this GPs vetting process, but it is 100% the GPs responsibility.  

Similar to a credit card.

As for ARV, you’ll want to look at recent sales of similar homes after they’ve been fixed up.

Similarly, quality dividend-paying companies often retain some earnings to reinvest in their business, increasing the company's (and your) value over time.

For rental comps, tools like Rentometer, Zillow, and Apartments.com are great for comparing similar properties.Feel free to share a specific property or area, and I’d be happy to help guide you through running rental comps.

You can also go on zillow/FB marketplace to see what other similar properties are renting for around where your place is at. 

We've learned many of these similar points first hand managing MTRs at scale.