Gets deeper from there, but that's the high-level.My goals included being work-optional well before the traditional retirement ages tied to retirement accounts, so therefore the places I put my money needed to afford more flexibility. 

Come and go because I always based my dreams of real estate off of traditional financing.

Unlike traditional rental properties, where tenants can easily move out, mobile homes are harder to relocate.

If this is your first investment altogether, I'd opt for a more traditional, simpler purchase. 

You could rent out your current unit and buy another house hack, or even convert the whole property into a traditional rental.

Depending on the amenities offered, and many HOAs in my market will also pay water bill, possible cable/internet, pools, hot tub.

I wondered if SF route might allow us to secure better terms at maybe a 4% interest rate for a few years on the funds not rolled into current $150k potentially assumable mortgage -- and in a few years we could roll into a traditional mortgage. 

Instead of leaving equity tied up in the property, you can refinance and put that money to work on your next investment.Advantages:Leverage: You’re using borrowed money to increase your purchasing power.Long-term Wealth: By holding rental properties, you benefit from appreciation, passive income, and tax advantages.Scalability: The ability to keep reinvesting capital makes it easier to scale compared to traditional buy-and-hold methods.Is BRRR Right for You?

Great news is when you get a deal there the spread is usually solid, bad news is many of the traditional marketing tactics don't work very well (at least in NYC where you cant cold call, PPC & PPL is really expensive and I don't know anyone who does well with direct mail).

Based on my knowledge of the market and similar properties I think these are at, or near, 2X market rent.I've use a traditional bank to finance the purchase of each of these buildings - using a traditional commercial real estate loan.