Is there some sort of limition on this method?

Your first step is to meet with your local buildings inspector to find out if your plans are even feasible.

I think you are referring to "cash for keys," be it through a formal rent control method,  or through ad hoc agreements with the tenants (cash and free rent for "x" period of time, etc..).

Since you don't own the asset yet, you shouldn't be discussing with tenants.One step that is sometimes forgotten is, once you have made a serious offer (your due diligence period), you should explicitly ask the seller ( as part of the offer) NOT to enter into another leasing agreement at prices/conditions not approved by you. 

If you can get sellers on the phone (and mail as well), you'll be one step ahead of the competition.

I'm stuck in the mindset that maybe Park City or Garden City would work for AirBnB properties, but is it a method that works elsewhere?

I don't have the capital myself and would only consider creative methods for my own BRRRR or similar project down the road. 

I'm interested in long term opportunities for cashflow and would like to attempt to aquire a few cashflow opportunities utilizing the BRRRR method. 

Knowing my timeline, do you think it's feasible (and wise) to start by going hard-core into wholesaling, then build up into fix & flips (for fast profit), and then rolling all of that income into buy and holds with the BRRRR method? 

Your corporate job will be a great stepping stone as you start to build your portfolio, and skagit county has some good opportunities.