Too many future unknowns with them.By the way, I lived in WA for 18 years, although I am from CA and moved back to CA.  

What is the process for alternative service for an eviction as he I in another state with whereabouts unknown ?

It honestly drives me kinda nuts when people assume the entire state is like SF or LA.HOAs are always going to be an unknown factor for as long as you own a property that has to bow to one. 

If you look at the lost income of one month per unit, then add in the cost to clean it up and fix it, and then put an "unknown" tenant in your units, I don't think you come out ahead.So, I suggest a middle ground - simply bump up their rent, but leaving it below market enough that when they look to see their options on Craigslist, etc., they will see they are better off staying put.They pay, they don't cause problems, and they aren't doing major damage.If you get into their lives and tell them how to clean and live their lives, they'll move. 

However, if someone wanted to test this fact, all they have to do is say, "Hey, my name isn't on the lease or the eviction papers, and I live here, and I'm not leaving, and the Bailiff couldn't evict them until the landlord filed for eviction on these unknown occupants who are in possession of the home. 

Many times, landlords have problems with college students and unknown criminal types.

And if it is close, consider that this new tenant may only stay a year, and then you have another lost month's rent and costs to turn it over again.And a new tenant is an unknown. 

And the HOA is always an unknown. 

I use these risk points and also the unknown total costs of option 2 to "sell" the Early Lease Termination fee.   

These unknowns can be dealt with in the lease with a clause about letting the new tenant break the lease if the unit is not ready on time, but it will still be a pain.The best way to get a tenant to be cooperative for showings, is to pay them.