If you want to manage properties that you don't own, then you'd need a license.You'd benefit from connecting with other landlords in the area that you do business in so that you learn the local regulations and requirements. 

Keep in mind that rarely, and I mean rarely do rental housing regulations ever come down to the size of the owner's portfolio.  99% of regulations will correspond to the number of units in that property not the total number owned by the investor.

Is the banking environment such right now that the math on a deal and the experience of the investor outweighs the personal credit to such a degree that looking for these types of financing situation is realistic?

Where you can go and chat with real investors in a live environment.

Hi, I'm new to real estate investing and wanted to see what you have used to be successful in finding deals in this environment.

I'm not advocating for never following rules you don't agree with... but the current regulations on STR's in GR are... well I'd estimate less than 15% of the airbnb listings are in compliance - (has to live there, can only rent 1 room, can't be away while renting, etc) - I'll jut leave it at that!

Due to stricter regulations in many newer condominium communities and it is less likely that your condo will become an illegal grow operation, drug manufacturing facility or party house4).

You can do one mortgage on one property, in the traditional lending environment.  

Don't want to deal w/ LA regulation when profit from Airbnb is starting to seem not worth it compared to longer term rental.

I prefer the no-State income tax environment of Florida, coupled with reasonable house prices.