But WA is looking to pass legislation similar to Oregon's that is much friendlier towards tenants.

If the program is revoked, any de legislation has been for new borrowers only.

You should considered talking to an architect who has done ADU work in the area to knock out some of the easier questions that are explicitly stated in CA legislation. 

I thought I remember hearing, in the last year or two, about some massive state-wide rent control legislation in Oregon.

I second @Kenneth Garrett regarding online resources, I use Rentometer, but more recently something else has helped me too: I joined a FB group of renters/sublets to find out what a room rental was worth, and based on that I was able to rent out my spare bedroom for 3 months during the legislative session -- $900 a month!

In a nutshell – the big government is coming after Real Estate wholesalers :) No this is not a scare gimmick, legislation against wholesaling has been passed already in states such as Illinois & more states are following suit.

I just came across this website with a nice graphic that may help answer:https://rentalhousingjournal.com/legislation-changing-in-many-states-to-make-them-less-landlord-friendly/#prettyPhoto

“This feels like groundhog day,” Florida Association of Counties legislative director Eric Poole told the committee before Thursday’s vote.

I am interested to see how that progresses as Rural parcels offer the most opportunity to take advantage of this legislation.  

Last year a short term rental law that limits short term rents in residentials in San Diego was passed then rescinded.I was wondering if that legislation is enacted in the future, will that concern MF (>= 4 units) also.