I preface this response with, I practice law in New Jersey not Washington.
In New Jersey, you can contact the county clerk's office and they have information regarding the steps to file a construction lien. You might want to check out your county's website and/or call the clerk's office. Good luck.
DISCLAIMER: Please be advised that this post is not intended to constitute legal advice and is for informational purposes only. This posting in on way creates an attorney client relationship. You should contact an attorney to protect your interests.
Before filing the lien you should check RCW 60.04, the chapter on mechanic's liens and be sure that you meet the requirements, have given the notices, and that the lien is timely. This is important because your company can be sued for filing a frivolous lien. You seem to be looking for a form called notice of claim of lien. These are available on line or by search the King County real property records on line for examples.
Be careful whenever using do-it-yourself forms, not because the forms may not be correct (that is always a danger), but because filling these things out, serving them, filing them, and making sure you have the right data is crucial, and it's easy to make mistakes.
Here is an article about the dangers of filing a mechanic's lien yourself:
If you want to do it yourself, check out this resource for Washington liens:
Free mechanic lien forms are included there. The service will file the lien for you for $295.
My Mechanics Lien Filing Service at www.zlien.com. Our number is 866-720-5436. Avvo's terms and conditions apply, answers on Avvo are general responses to hypothetical scenarios presented by questioner.