There are a lot of snakes in this industry, so I respect your discretion. 

As @Troy Gandee mentioned use the tax estimator on the County website or call the assessor.

Their website says they do lots of things in the real estate world but there isn't much detail.

Theres a website called plexerr.com that pulls comps and exports to CSV.

(Like I think Craigslist is still one of the best websites on the internet, but for some people it's a total turn-off because it still looks like 1995).Capterra.com is a great site for research in this category (and business software in general). 

I was just banned from sending the same introductory email to 3 members.I am new to this website- what did I do wrong?

I'm unsure if they lend on new builds or not, they do have a website where you can set a virtual meeting with them.https://www.goodfaithfund.com/

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.

She was very pleasant and explained that their website doesn’t work, which we thought was a bit unusual.

Glad to hear the website postings can be a legit source for a deal.