Things that impact the grade of the location include: proximity to amenities, crime rates, average household income, proximity to employment (and the type of employment), aesthetics of the neighborhood, proximity to restaurants, shops & bars (and the quality of those restaurants, shops & bars), proximity to schools / colleges / universities (and the quality of those institutions), the grades of the surrounding properties, etc., etc. 

@Bill Brandt I am just reporting what two National institutions reported.

That is the biggest issue for non-institutional guys. 

I'm familiar with commercial /institutional construction projects (I'm an architect in DC).

According to the National Institute of Building Sciences’s Off-Site Construction Council, when fully built, modular apartment structures reflect “the identical design intent and specifications of the most sophisticated site-built facility.”FASTEST GROWING SECTORLittle known fact: Multifamily was the fastest growing sector for the modular industry in 2018.

Anyone know of any institutions that will provide a HELOC on an owned rental property?

And unfortunately, even if these small residential loans are for investment purposes, lending institutions still use consumer loan requirements.You can obtain non conventional financing, these sources will probably lend at 7-8% interest, however the deals you purchase will result in a lower cash on cash return.

I think the big issue that needs to be solved prior to mass adoption is the integration of county records with blockchain.

There also needs to be cultural adoption in your city for the RBTR model.

I did "apartment hacking" for years and saved a ton of money by charging my short term roommates/tenants 65% of the rent (shhhhhh don't tell my landlord:) However, I didn't really wanna go that route in Houston as I'm looking to adopt/foster a child.