Here's a https://www.irs.gov/businesses/cost-segregation-audit-technique-guide-chapter-4-principal-elements-of-a-quality-cost-segregation-study-and-report to the IRS website noting specific items that are included in the cost segregation study report. hmm, that website is a 404 error.  

Here is the podcast episode that I am referring to when asking this question. 

I dislike they refer to it as Airbnb calculator.  

Quote from @Chris Lo: Which platforms/websites do landlords use to find the rent rate, how long the rental properties have been on the market, and all the details about other rental properties?

I tried to go to the website referenced, but it gave me a 404 error.

We’ve been victims ourselves and I’ve been told that directly by law enforcement.We had a scammer create a very professional website using the exact name of our lending company.

You can use the "website" button in my signature below to set up a day/time that works for you.

Im even referring their properties to my friends and I look like a fool referring people who then see a scathing post from me.PLEASE remove the post. 

For example, to get up-to-date property tax data you would need to scrape every county's tax data website (thousands of different websites, data formats, issues, etc...) then aggregate and clean the data.

Image for reference.