Loan programs that utilize AirDNA income projections to qualify can also be utilized for cash out refinances (if not currently operated as an AirBNB) although some lenders have a maximum cash in hand of $500k-$1M typically at a lower loan to Value of 65-75% for investment property vacation rentals. 

In AZ, almost everything is utility scale, so 2.5 acres isn't going to attract much attention from power purchasers or solar developers.

My assumptions based off research is I will be able to deduct 1/2 of all allowable expenses based off the ADU square footage (My understanding of that list below)  1/2 Mortgage Interest (Not principle) 1/2 Utilities 1/2 Property Taxes 1/2 Insurance (assuming I don't have separate ADU insurance)  1/2 general house maintenance (depending on the issue and if it's related to the ADU)  1/2 Depreciation (Home value, not land divided by 27.5)  KEY QUESTION: If my mortgage (PITI) is $5400, and all of those ADU deductions equal $3800 monthly, and my ADU income is $1800 monthly, am I allowed to pay the difference in "deductions" from my real estate business income? 

Question 2: Should I be utilizing one of these approaches (or another way?)

Operating Expenses:Consider all the costs of running a B&B and event venue—staffing, cleaning, maintenance, utilities, insurance, marketing, and supplies.

It is not just a mortgage and utilities payment each month!

Separately metered gas & electric are generally viewed as more valuable because water is less commonly metered.

Last, there are a ton of unsecured loan options for you if you have decent credit (usually 700+) and low credit card utilization (under 30%). 

If the utility companies are all different like the properties are in different counties you can put all the properties on Google Sheets/Excel and break the pages down by county and list the addresses going horizontally and put the things you are looking to track Taxes - is this not built into the loans on the properties? 

One of the common things I see with newer investors (I was guilty of this as well) is the "shiny object" syndrome.