If it’s going up in value why would you sell it??

They require you to purchase a package of a minimum # of searches per month, but depending on how much you are lending out it might make sense to subscribe even if you only will use just a small part of that quantity over the course of a year.The data they have on everyone is insanely detailed - way, way beyond a simple background and credit check like we run on tenants.

Not sure if that is the reason for what you're seeing but then again, Redfin wouldn't be my choice to get that data.

In which locality are you attempting to procure data? 

Your property manager should be a valuable resource that you can get up to date market data from and they should be your resource for securing future investment properties as they will know the rental market better than a regular sales agent.

There is a large park about 2 blocks away and is in a very walkable neighborhood close to everything in the city (of about 180,000 people) Do you have any rules that you have to add in value in this different way? 

Use current data for calculating rental amounts in your area.  

@Sabri Isbikhene If you want to go into a market that cash flows, but has a brighter future (based on today's data), you may want to look at Kansas City and Indianapolis.

.#4 Compile Your Prices into a Spreadsheet or Estimating SoftwareOnce you start to get a better understanding of Labor and Material costs you will want to store this data into a spreadsheet or software that you can use to help you streamline the estimating process.The Book on Estimating Rehab Costs comes with a spreadsheet that you can use to help you populate your own database of labor pricing and material pricing.

VRBO, Evolve, Vacasa and others will provide projections as well, but I think AirDNA and Mashvisor are going to give you more accurate data.