If you see numbers work from an objective perspective-, go for it.

I just use my own spreadsheet but I'm sure BPs calcs are even better.I actually don't even use those rules and like to go by cap rate as I am in buy and hold so it is more of a business perspective.

In such cases, the tenancy is considered month-to-month from the tenants perspective (regardless of what is indicated in a written lease) and they need only provide 30-days notice of termination.  

I know it is frustrating from a principal of the matter standpoint, but from a business perspective it really isn't that bad. 

There is only a down side from your perspective, as I don't see rates going down in the very near future.

I think most people have covered the accuracy of Zillow very well.From my perspective, I use ZEstimate as a ball park number when I need a quick estimate for any wholesale deals I am working on.

As a guy that was in the crash of the late 90's as well as the crash of 08' and in the banking industry, I can say at least from my perspective that it's a different world and in my opinion, one for the better as far as laws and regulations go.

From a strictly business perspective, most of the tenants utilizing those programs will give you issues in one shape or another.

@Diante LawrenceI can speak from the perspective of buy and hold. 

@Jonathan AlexanderI think you need to step back and look at it from your potential partner's perspective.