In my case, I have residential rentals in one LLC, commercial properties in another, self storage in a third, and my real estate company operates in a fourth.

The third is to hire a professional collections company.

I would third to hear @Steve Vaughan, and @Jay Hinrichs, I would also like to hear from @Minh Le , or @Bill Gulley as well. 

Sorry for the questions, trying to understand third party software support needed

We also do 3rd party management for other owners too.

you're still entering into a long term relationship but with only one other party. 

The fact that there's only 2 meters on property is a huge hint that the third unit may not be legal or may be a legal non-conforming use.My guess is the property has a main house and an ADU that was once a shed or a barn in the back.

Third, we would meet the contractor there and let them in. 

I doubt 99% of those that were drafted have been licensed for circulation beyond the intended party but that's besides the point.  

Given the current market, where it is hard enough to find a deal without a third party making money, I don't see how that would work.