Do right by them and word spreads, momentum is built and eventually you are raising money from PE firms, family offices etc. if you care to grow beyond your personal network's means. 

Add utilities, lawn and pool care $800-1000.

I’ve dabbled in real estate too, and I think using a home equity loan can work well if you’re careful.

Maybe have a decent sized pool of cash to take care of the occasional roof repair or personal expense, but almost entirely in real estate?

Does the builder have any incentives to work with their chosen lender?

Just because Zillow estimates a lower value, doesn't mean people will offer lower than the list price.Also, be careful about the laws with the association and renters.

Case and point today we spent 6 hours onboarding a new house in Kissimmee (outside orlando) whose prior cleaners did not care.  

As for your lease, I'd be careful with what you are doing there.

We do Urgent cares all over the county and get pitched med office spaces all the time, and none fit our profile for visibility, for our use at least, only because we follow a more "retail" modeled approach to site selection, given the business type.  

I would be careful about sourcing these types of lists from other operators, it takes awhile to build relationships with various companies and most of the company contacts don't like their information being passed around