Legal Question in Civil Litigation in Washington

I think your friend's declaration of service should say something like, "On _____ date, I caused _______ to be served upon the law offices of Huey, Lewey, and Deuy, PLLC, attorney for the plaintiff/defendant in the above entitled matter, by placing the above listed documents with the _________________[secretary's name if you have it], plaintiff/defentant's attorney's receptionist."