Some assessor databases are easier to specify your search than others.

How big does a contact list or mailing list need to be before it makes sense to switch from a spreadsheet to a database?

I can say I would not have had the confidence to purchase my MF had I not started out as an agent.Aside from experience & confidence, you gain access to the MLS which is the most reliable database (in my opinion) for running comps in your state. 

Also, when you hear about "sanctions" against countries and people, there is a federally maintained database of verboten persons. 

A long-term option is the get your hands on the P&Ls for every new listing that meets your investment criteria and create an ongoing database of operating expenses.

Haven't zeroed in yet, or developed a database.    

I would guess it would be pro data based on the replacement property cost for each, but I’m throwing darts.BTW, your 15% calculation on $16k cap gains would be $2400, not $1600....small brain fart I know.

An agent who knows what they are doing and has a strong database to market your house and the ability to market it well. 

we did not pay anything.. keep in mind West coast and East coast title companies are so completely different.. we have a customer service department that is all digitized.. info is at their computer monitor and in their data base.. 

Some cities have an API that let you pull data from their database.