Be sure to have a data room or dropbox that has three years of financials, color photos or appraisals, leases, resume, PFS, etc. 

GRM on a comp comes out low, well that is one data point. 

My goal is to find sales within 1/4 mile and 6 months, but I frequently don't have enough data without pushing out both radius and time. 

You can do a basic title search on a sheriff sale property like on any other property:  using a title company, attorney, or a visit to the country records office.This county's data may be online and searchable (sometimes for a fee), so you could try that, too.Best of luck!

If they see a wave of listings in a particular area and learn that there is going to be some major drainage work done two years from now that will significantly impact taxes, unless your going to meetings at city hall or live in the neighborhood, those are likely things you may miss.When you do begin to narrow down properties you like, they may be able to provide you with data that will reaffirm your own in regards to comps in the area, ARV, and the direction of price trends. 

Curious if the local lenders look for anything different in valuation models versus US banks. 

-DonOpendoor Data Scientist

@Kyle AltenauThanks that broker will definitely be invaluable.

Like you mentioned most doing ADU's are keeping the properties so there are few data points for appraisers and they haven't yet received guidelines on how to approach them. 

We are in the latter stages of finalizing a private equity fund that will be investing in value add SFR.