I agree with @Vincent Crane
@Allen Clark, I think you are missing a few things in your formula. you need to take into account vacancy, maintenance, and capital reserve.
The rental market is hot in Seattle so the vacancy rate is low. But this is not going to last forever. Even as hot as it is now, I would consider 4% (2 weeks per year) vacancy in my calculation. You will need sometime to do cleaning and minor repairs between tenants.
The unit is relative new so you don't see much maintenance and R&R (repair and replacement). Regardless the age of the unit, drain will clog, garbage disposal will break, carpet needs to be cleaned/replaced, gutters need to be cleaned.
It's unlikely you will need a new roof or furnace anytime soon but you should plan for them if you are going to hold the property for a long time.
If you take into account all these into your calculation, you probably won't see much cash flow.
I am not saying it's a bad investment. It probably is a good one if appreciation is taken into account.