I want to keep them separate to manage activities according to each regulatory agency.

There is nothing about how long you need to occupy the property for.So unless our lender puts a demand on us I see no problems legally in occupying each property for any amount of time to fulfill the requirement, then rinse and repeating this process up to our full entitlements, so long as the lender is willing to keep giving us loans.

You are particularly interested in short-term and long-term rentals, promising ROI, and locations with a mix of affordability and growth opportunities.Being willing to move and live in a part of a 1-4 unit property will help you get better financing, for sure, and require less down.

I own a 4000 square-foot warehouse that has about 1/3 of an acre lot fenced in. I'm considering leasing out storage space for boats and RVs.  Zoning says that it is a repair service shop, excluding automobiles, any id...

There are very few Qualified Intermediaries with any kind of regulatory oversight. 

Two thoughts - 1) We have seen the Blue areas become much more regulatory, as we would expect from that mindset...but yes, I gotta agree, I think it does cross the line in this case. 2) Not all neighborhoods resent STRs. 2 of my STRs were in neighborhoods where they were actively welcomed.

As U.S. citizens residing in Europe, we are required by the local tax code to hold the property in our personal name.

In general, DSCR loans will require the property to be either leased or at least "Rent Ready". 

The short-term rental market here is particularly lucrative, though regulatory changes can impact profitability. 

This is a separate concept and does not replace the 750-hour requirement for REPS.