I own a property with them in Arlington that i purchased in 2020.

The best way to build relationships with cash buyers is to establish yourself as an authority in this space.

Be perfectly happy watching someone else make a giant pile of money pursuing a strategy that you have no interest in doing.2.

And if so, as I'm paying down the original primary residence HELOC, in the future, can I use it again to purchase a rental investment?

Hello,Hello I would like to learn how to buy, negotiate and finance a house in foreclosure or reo to flip

First, if you're getting $75/month in CF ($9k/yr), and you put $110k in cash in, your CoCR is 9%, not 9.5%.Second, and this is the number that counts (% mean nothing, and will lead you to illusions), if you're getting $9k in cash back/year, and you put in $100k in cash, it will take you (if all goes perfect) over 11 years to recover your cost (cash). 

Friend of a friend with a portfolio of 30+ homes was contacted by them to basically sell his portfolio to them in exchange for shares.

Despite the mess I was in, she stepped in and took charge of selling my property with absolute professionalism.

What are the other properties in the area worth and was are common features in them?

Those connections are true but worth it in many ways.