You may have seen my other posts in here related to a small mobile home park with 1 ranch home and 5 mobile homes.I have been waiting on the information regarding the septic design of this property for months.

A HELOC or loan on your primary could provide funding, but that is typically not designed for longer term funding - i.e. a down payment on a multifamily....

I am a former NASA robotics scientist... trust me when I say, it IS better because I designed it to be better!

Additionally, I collaborated with architects, engineers, and contractors to finalize the design and construction plans for a stackable duplex.

Additionally, I collaborated with architects, engineers, and contractors to finalize the design and construction plans for a stackable duplex.

You need to do an independent review of the sold comps, DOM, and the finishes you need inside to get the ARV you see.3) When projects pass the paper test and pass the number tests, then you need a GC and an Agent or some kind of designer, who have already looked at all the comps, walk the space and put together a budget that works and that will get you the number.4) Now you need a good relationship with a money source. 

When I internet search “residential definition” the first definition is ”designed for people to live in”.  

@Jamie Parker, most of what you'll see in the education space of REI/business is fluff and designed to take your money.

I'd find a mortgage broker who understands your strategy well enough to advise on products designed to help you scale. 

I understand home designs are pretty expensive, and cannot just be applied to any lot/existing neighborhood.