I have borrowed against the property to fund other development projects via a heloc.

Plenty you can do, even at 15.I think a guy your age for example could develop a nice small business of iphone consulting. 

Assuming the deals are value-add or new developments with moderate leverage/risk targets.

It explains the team that you should develop to have a strong foundation under you while investing remotely.https://www.biggerpockets.com/blog/core-four-real-estate-teamI’d be happy to connect and chat anytime!

We were interested in learning how to develop proper systems.

Mike Zuber has an excellent story on how this is possible and probably an excellent way for the any new investor to develop their wealth. 

The rules are totally pro-scarcity and anti development, that's an excellent business venture if I am pouring in billions. 

https://michiganchronicle.com/2024/01/03/major-developments-that-will-define-detroit-in-2024/Hit me up if you'd like to know more.

Can I expect more development / gentrification to occur in this area?

Quote from @Daniel Kulik: Hey everyone, I'm developing an automated property management software specifically designed for small to medium-sized landlords.