Here in New Mexico we use a special form to address this very problem.

Providence maybe?

an example might be a 3 story brick building that could be replaced with a 3 story frame construction building at a lower building cost but still provide the same function.You should be revising the values based on the way your policy is written above. 

I can see that Lizz has included a leasing fee in the property analysis docs she provided, which I assume reflects the lease only service you mention.

However, it seems to simply attempt to provide the revenue side of the equation. 

I clean all shared areas of the home, cook occasional meals for guests, lawncare, maintenance, and shop for them (consistently provide milk, bread, basics etc)?

Best to talk the tax issue over with a CPA but the loss will be reflected in the K-1's and can offset gains in other deals, provided they both flow through to the same entity (or you personally).

I also can provide context of what characteristics each area has.

@Alex Clark James Wise will be your guy for this area; looks like he already provided a guidebook for Cleveland.    

If anyone could provide contacts in the Buffalo area that would be great!