Sure, you can find skip traces out there that are 4 cents per record but you end up getting bad data or 9+ numbers that you have to sift through to determine if they're the right person or not; often times the phone number/contact will be information that was correct years ago.

Hello All,I am looking for referrals on sources, readings, data, etc on how to increase your rental property value after purchase.

If the property was levered up with low interest rate long term debt then a 35k increase in value might have been seen with only 70k (10%) invested.

The $123/SF is based on what the county will allow me to use to based my estimate to determine if I will be above or below the 30k, based on some data they have available.

And when you manually sift through the rental data you can screen out the slop which invests time to achieve maximum accuracy.To evaluate for a single property address what I would do is go to realtor.com (which directly sources from the MLS), hit the rent tab, put the county of the property you're evaluating, and go to map view for a zillow-like view of what rentals are actually listed at what rent price. 

I think OpenDoors will have more and better data than Bigger pockets, but, good luck.  

I've lived here for a long time so I know my way around and I can provide an opinion, however I'd like be able to provide some objective third party data that assesses/rates or compares the neighborhoods in the Twin Cities and surrounding area to assist in their search. 

With the little data we have seems like COVID is the likely issue here. 

I like having access to the MLS, my local board group for networking, easy access to tax data, etc.

Try going on a "break" with that realtor and look specifically for one who not only understands investments but who also has good technical acumen for exporting and doing deep analytics on the MLS data.