7:33 PM: Thanks to those who sent photos (the one above is from Jamie) – the smoke you are (or were) seeing is from what Seattle Fire has initially described as an RV fire that spread to a building at Colorado and Hanford in SODO [map].
7:37 PM: SFD says the fire’s out and no injuries were reported.
8:28 PM: Since we were in the area, headed back from the light-rail meeting, we checked out the aftermath:
The SFD crew that remained on scene confirmed no one hurt and no significant damage to the building, which is open-faced and holds metal materials.
ADDED 11:56 PM: Bill Gobie sent this video:
This was along his route home.