One hard money lender told me they don't do loans of that nature, and I am meeting with a different one tomorrow.Curious if anyone has any solutions.Thanks! 

Quote from @Joshua Lee: I've read about house hacking the BRRRR method, FHA loans, etc..

The best technique I found was D4D and use the 'sniper' method.

You need to always Google Search for Reviews and comments for any type of Market Investment Method.

Has anyone deployed this method and found success?

I have failed with the google docs method and my last time tracker was too complicated for that I needed.

I wonder if other mixed-use landlords have clauses in leases that address the mixed nature.

What kind of taxes he will incur depends on the nature of your "partnering." 

This method cost you nothing.This is a good starting point to build investment capital while you learn.If you plan to buy and hold or rehab and flip, then you will need either investment partners on conventional funding sources. 

That means you have to have a reasonable method of valuing the real estate holdings at market value as of 12/31 each year so that you take out the required minimum distribution amount.