There are plenty of tie-down rings & chains on the ramp, and no charge for short-term use (less than two weeks). A marked helicopter parking area is also available.
Seaside has 5 box hangars, individually owned, which come up for sale or rent from time to time. Currently (August 2022) there is one hangar for sale - call 425-246-9962. You can also get more information about the hangar bylaws and lease agreement by emailing firstname.lastname@example.org or call 503-577-6153.
We regularly receive inquiries about more hangar space, but public funding just isn't there, so the most likely scenario would be a private project funded by one or more individuals. The airport committee has history and expertise to facilitate such a project - if you're interested, send a message to email@example.com.