Real estate purchase using reasonable leverage, at todays interest rates, will build up equity through amortization.  

Basically common contract or agreement law.

Especially on small multi family buildings since most of them are in more urban areas. 

I would be happy to share my experience in knowledge in this area (MA and RI) as I continue to look to build my portfolio. 

I’ve seen several three unit buildings in weehawken recently converted.

Hiring a contractor to assist with repairs and a property management company to manage rental.

Even if I am to not be taking home the lion's share of initial deals, I'd like to still be building some capital for future dealings.

My previous renters were relocations - either had sold their home and looking to buy another (low inventory so takes a while to find a home to buy) or moving here from another city and didn't know yet what neighborhood they want to be in, or alse building a home and need a place to live until it's completed.

You don't have to be a contractor but it will save you a good chunk of money. 

You are working a demanding corporate job but also want to build rentals on the side.