The requirement for the second HVAC system isn't to reduce noise transfer between floors, but to accommodate the requirements for a completely isolated and separate heating system.

As the nurses strike here at the UofM hospital system, I understand this is not an isolated problem.Support your decision to become financially and career independent with real estate.Recommend focussing on the BRRRR method and you can find great resources on that topic here on Bigger Pockets.There are properties that cashflow strongly and fit the BRRRR criteria within an hours drive of my location in Ann Arbor, MI.You might look within that radius near you for these properties.Find an investment friendly Realtor with relationships with wholesalers, property managers and contractors to make this experience sustainable for you and your family.Happy to help!

Its also an isolated segment of the House that is in favor so I don't think it will even survive the first vote, but it is an interesting discussion. 

It is easier to get loans, insurance etc and transact under your own name If you were doing this llc transfer because of asset proportion, well, contrary to common belief, the llc does NOT protect the asset, it only isolates it from other assets If you have a home in an llc and you have equity in that home they will go after the equity by suing the llc anyway - even if you don't pay right away they can force the llc to sell and get paid The best way to protect your assets is 1) keep the property in your name or whatever entity name you have currently 2) set up a Wyoming LLC and draft the OA to have several business purposes and Ibe of them should be asset protection 3) capitalize the entity by placing a promissory note equal to the equity you have in the property you are trying to protect 4) record a lien against the property payable to the Wy llc 5) you would have a 1st lien to some bank and the 2nd lien to your Wy llc 6) the llc is tax neutral because it should be a flow through entity back to your living trust Anyone trying to sue you will see that 1) you have insurance 2)you have 2 liens and no equity 3) they will end up settling with your insuranceWhen you sell the house, you simply show the title co.

Now, markets like the Bay Area have to be looked at in isolation.

Probably you can save the cost by isolating the cause.

I created my own P&L in excel, so I can just manually add all the expenses to each property so that I can isolate the profitability of each rental. 

The case law that came after they tried to isolate all of the assets of the different LLCs from the cab company was that if the LLC's were engaged in similar businesses with the same ownership then there were essentially the same company.

If this was a single family that was turned into a duplex this may not be possible as the ducting may not be isolated for each unit.

You might have to isolate systems in the house by disabling features.