I have noticed this too -- meant to comment on it last month and got side tracked. Uber seemed last month to use it sporadically, now it's almost all the time during working hours. They leave at night (or they just go back to using their parking lot).

Eric Hines assigned this issue to Eric Hines

Your request regarding illegal parking has been closed.
You are correct, they are Uber drivers who are parking there due to no space in the Uber business lot and that I write them parking tickets when they park illegally upon the roadway. I have watched the drivers and they are parked there temporarily while they go conduct Uber business and then leave. The park parking lot is not posted with a time limit for parking like "11pm-8am, or a 4 hour limit.
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Tukwila Police Department