While the bookkeeping will likely be complicated, is the accounting/taxation on this STR based on 100% STR income/expenses allocated 100% to business and general house expenses (mortgage, utilities, depreciation etc) pro rated between STR/personal residence based on sq footage?  

However, if have several rentals and need to deposit checks, or use a debit card to pay utilities and other bills, etc. conventional business bank account would be the best choice. 

I split my house up into three units. One unit has nearly the full back yard and has a lot of water irrigation. The front yard is a common area for all three units and also has a lot of irrigation. How do I go about d...

If the Multi-Fam does not have individual utility-meters for all units, then you have to figure out what to do or it can potentially eat away at your cash flow.  99% of Single Family homes do not have this problem.These are just a few pros and cons. 

But many of our clients utilize our DSCR loans to purchase and re-finance long-term rentals (LTR) and we have to loan to an entity because it is a commercial loan per se, so that wouldn't be problem for us. 

Utilizing the same approach can can assist with for-sale housing as well where you can decrease DOM and move your inventory quicker, thus saving on carrying costs.

I am interested in building my wealth and need a great agent with amazing resources that can help me get the ball rolling. 

How many lots, public or private utilities and who pays utilities?

Some examples are;-County website for actual prop tax bills-Tenant estoppels-Actual utility bills-Bank statements and tax records-Verify insurance premiums with your carrierSome say "Trust, but verify," I say "Trust that someone selling you something will only show you what you want to see.......So verify."

I have turned 8% ROI into 18% ROI by utilizing wrap around financing when selling, as an example.