I would park on a neighborhood side-street and walk. Some people of course may object to this but when I lived in the area I didn't care. Finding an open pay to park lot and walking is always an option or public transportation is usually very reliable.
The Sunset Transit Center in Beaverton and then a Max ride. If you really have to drive, you can try some area parking garages in downtown and maybe some street parking, but parking is a challenge in the area.
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