If you're looking for a Limited partner (LP) to bring capital to a deal there are a few forum post on here how to structure those deals. 

Thank you for the input, I will measure the distance from the window sill to the third floor carpet, it's pretty low, let me see if I can attach pictures.

In other words, will my line of credit be limited by the old furnace by more than what a new one might cost? 

The main downside is the loan limits for a house with ADU match a single family, not those of a duplex (which is higher).

On the flip side, there is no limit on how much money you can make.

That severely limited the number of lenders I could go to, so I ended up finding a loan product (that costs a premium, albeit) thru Velocity Capital Mortgage that allows fully-amortizing or IO payments (for first 10 years) which will help me build cash flow and accrue title seasoning while I find the right time to pull the trigger on a fully-amortizing DSCR product Did you work with any real estate professionals (agents, lenders, etc.) that you'd recommend to others?

The county assessor has it as $502 but says that is a placeholder for all land values in the Pima County area.Our next option is to find a RE professional who can perform a limited scope land appraisal by pulling land comps from the area. 

Although loan amounts this small are going to be very limited to hard money lenders.

Home365 quoted me by phone last week 7% monthly management fee and 50% placement fee for their "Standard Plan," but their WRITTEN Prop Mgmt Agreement actually lists many fees and limitations.

(I recall she said she has a Morrison address, but that doesn't mean she's in the city limits.)What's your goal?