If low wet ground check with people moving dirt for free fill dirt.

Works great because I get guaranteed revenue either way and the partners are happy to be silent investors who get a check every month. 

Then just write a check.  

A nice portfolio is 10-40 properties, and yes you should drive by your own assets to check for broken windows.

One of my listings, www.cameronranchglamping.com I list them on my direct booking website so can guests can add them as they check out and on Airbnb for exmaple, I just out it in my listing description and send them an auto message once they book if they want to add on anything.

If you want to look at a cash flowing market like the midwest here in KC, I can show you some data points around this part of the country. 

I called the current landlord and he was completely surprised by the reference check. 

Be sure to check out the free tools BP provides to help analyze deals you may have and also market insights.

If so, just look up their data or ask for it.

If it sits vacant for months at a time, the data model gets recalibrated and they'll tell you to lower your rent calibrations, but maybe what it needs is someone to tell you "you know what?