This was a proof of concept that Midwest rentals can and do cashflow atm without the HELOC part and with more conservative numbers that was in the concept of a discussion with someone else.

Having the other heir sign a quit claim so the paper trail is bulletin proof.

Under the IRS rules, a person  qualifies as a real estate professional if: (1) more than one-half of the personal services the taxpayer performs in trades or businesses during the tax year are in real property trades or businesses in which the taxpayer materially participates, AND.....(2) hours spent providing personal services in real property trades or businesses in which the taxpayer materially participates total more than 750 during the tax year.Like @Greg Scott and @Russell Brazil mentioned above, I don't believe that you would qualify as a REPS, but if you are going to try it, make sure you document it very well (i.e. with some kind of proof, like time cards, mileage forms, and/or receipts, etc.) so that just in case you do get audited, you at least have something to provide to the IRS agent. 

Generally speaking, other than a fire wall and additional sound proofing, what other costs come into play w/ duplexes or mfh in regards to that joined wall?

Its not bullet proof but close to it.  

Should I future proof it and just go 400 amp service and add an EV port outside where the MTR will park as well?

I already will have enough saved to make the payments for an entire year while I am in school so if I provide them proof of that will there be an issue?

  ( and we don't go to closing tables on the west coast by the way LOL) Their is EM that needs to be put down.. some sort of Proof you can close Not sure how they teach that.. along with the MONEY you need to do the preliminary work to get to entitlements which is what the builders are looking for..

In B-lending and private, we also require proof that all CRA debt is paid off.

I know this as I am paying the draws and getting inspections to proof it up..