Do you know of any good websites where I can post my deals?

You can't list your commercial rentals on their website, it is definitely geared for residential rentals.   

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.

This website has been so enlightening to me but I am super new to this.

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.  

Their newsletter/website/social media has all the vendor recommendations for our area.

I have no experience with this group but just visited their website. 

Just click on my website link in my signature line and you can schedule a time with me to learn more! 

As you go on your real estate journeySomething I would recommend for you is this website. https://www.areavibes.com/Use this rating and classification system I have created over time to get an idea of the "Class" for the area - A class B class & so onHere is my rating & classification for each livability score.80 and above A+78/79 A76/77 A-74/75 B+72/73 B70/71 B-68/69 C+66/67 C64/65 C-60/63 D59 and below F

In terms of renting it out - we saw the unit was offline on Zillow and other listing websites depsite the fact it was supposed to be on, and we were the ones who notified them of it.