@Henri MeliI used to live at an apartment complex that had a billboard on site.

Specifically around Dulles airport.https://www.aol.com/article/finance/2018/09/13/insiders-are-buzzing-that-northern-virginia-could-soon-be-awarded-amazons-hq2-as-jeff-bezos-makes-high-profile-visit-to-washington-dc/23526449/ 

@Dave FosterPlease do me a favor and don't speak for 99.99% of the people on this site. 

This site is geared towards finding motivated sellers as a wholesaler, not a buyer/listing agent.

Little did I know the next time I visited him the house was turned into a penthouse suite in the heart of beautiful Polanco, Mexico D.F.

That is because the owners typically contribute thousands of dollars worth a "sweat equity" -mostly site prep and painting.There is a shockingly high demand for short and intermediate term single rooms with bath. 

I was trying to find some tax delinquent properties (or any deals) in my county, and so started with the county website. The website, and county worker, both said that any list or listing by the county cannot be used ...

Welcome to the site Ed.

You can try one or several sites as this one: BP, and/or Meetup, and/or LinkedIn, and/or Facebook.

I would also like to network with people on the site so I can learn from some seasoned investors as well as partner on deals in the future once I have done a few investments myself.