UPDATE: The power was all restored, says City Light:
@SEACityLight: Seattle City Light crews worked through the night and restored power to all Leschi area customers at 6:30 a.m. today.
A tree fell on a power line in Leschi, causing a large power outage stretching as far west as 23rd Ave, north to Union and south to Jackson, according to @maggythebrave.
City Light estimates that the power will be restored by 1 a.m. For updates, check in with the City Light outage map.
UPDATE: From City Light:
@SEACityLight: City Light crews have restored power to all but about 788 customers in Leschi area.