Free tool for new or current real-estate investors - feedback

Idea: Real-estate investors need to keep their finger on the pulse of the markets they are in or considering entering. The rent collected from tenants is one of the strongest drivers of ROI for these individuals, so knowing what to expect in a particular zip code is essential.

Your opinion: Do you think this could be useful? What other features / search options would you like to see? Any other feedback?

Site: http://rentaltensor.com/

Misc: Very new to web development so I know I need to work on the mobile version etc :)

Thanks in advance!