My question pertains to my wife who has not been granted citizenship or a green card in the US yet. 

Written by attorney investors, it's full of practical advice pertaining to management of investment property, has sample forms that can be edited, and - most importantly - they tell you what your primary state laws are and where you can read them.

I would love everything from insights pertaining to the Snohomish County RE market to networking groups.

If you are specifically asking as it pertains to becoming a landlord (which presents different legal issues from flipping or other types of investing), then you would look for an attorney specializing in landlord-tenant issues in your state. 

I'm a bit clueless on how that process works as it pertains to permitting/zoning/etc., but I'm intrigued by a few possibilities.

These usually if not always pertain to residential property.  

But pertaining to the HOA foreclosure in which your friend purchases 2nd lien HOA foreclosures and then WAITS for the 1st lien most likely the bank to then foreclosure on him which we know can take quite some time and can be pushed back.

Included would also be a Limited Power of Attorney to give you rights to update/modify/change/payoff, and discuss all things pertaining to the mortgage and the existing insurance polity.  

city of Milwaukee has a large amount of regulations pertaining tof rentals.

I read an interesting article on PA laws as it pertains to licensed and unlicensed real estate transactions and deals.