Hi Mike and Jane,
Looks like it. The Washington State statute defined short-term rental to be less than 30 consecutive days:
RCW 64.37.010: Definitions. (wa.gov)
"Dwelling unit" means a residential dwelling of any type, including a single-family residence, apartment, condominium, cooperative unit, or room, in which a person may obtain living accommodations for less than thirty days, but not including duly licensed bed and breakfast, inn, hotel, motel, or timeshare property."
We are not licensed to run bed and breakfast, inn, hotel, motel or timeshare property.