I am starting an office cleaning business in Seattle area along with my brother in law who ran this type of business in California. Do any one know what rate I should charge per Sq. Ft in Seattle? I would appreciate for any suggestions that will help me successfully find and bid the projects. Thank you.

It varies for many reasons including the competitive atmosphere in your area.

There are quite a few threads concerning the cleaning business on this site, you can possibly benefit from searching them. Many of these threads/posts have very detailed information.

Stringer