Is there a need for accounting and limited property and CAM management on commerical properties?  

However, there is a limit to what sewer pipes can handle.  

BMO Harris allows multiple business checking accounts for Series-LLC's and there's no limit to the number of accounts.

I recommend you really study this issue.

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. 

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.