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.

According to local Residential Tenancies Act, I can serve him a "Notice of Entry" and enter in 24 hours, regardless of whether he welcomes it.

You would be off market campaigning for a first timer, in the same areas (Palm/Broward) that highly experienced investors are campaigning as well.There are high barriers to entry, but that isn't to say deals aren't being made.

Use current data for calculating rental amounts in your area.  

Hope this helps.You would need to submit plans for the second story, go through plan check, get a permit, build, have that permit finaled, then come back to us with the plans to convert.One thing I want to make clear is that the new addition must be interior connected to the house, but in order to qualify as a JADU when converted, will need an additional entry.

I did several research on several countries and for me the United States and the safest market with an entry ticket that is within my means.

.#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.