Quote from @Ryan Konen: You are correct that comping software like Privy, Propwire, and Propstream primarily rely on public records for their data, such as county assessor records, MLS feeds, and sometimes 3rd party aggregators.

I'm developing an AI-enabled analysis and lead generation tool for REI.  

Not sure whether the calculation is correct.

Check county recordsUse online search tools like PropStream, Reonomy, PropertyShark, etc.Use local GIS mapping tools (ask your county)Search online directories for LLC or TrustTalk to neighborsHire a skip tracerSend a letter to the propertyThere are a lot of options.

Take advantage of the great learning tools it has offer.

Then add other tools (niches) to the tool belt.

After tons of research, we've found that the resources, tools, and ongoing support they provide are truly unmatched.

Platforms like Zillow, Realtor.com, or even tools provided by BiggerPockets can help.

A strong team can streamline processes and reduce headaches.Expand Knowledge: Podcasts and forums like BiggerPockets are great tools.

BiggerPockets has some pro tools that let you see rent to price ratios and other cool stats, I use this to check out various markets and which seem to have better/worse profitability.