I’m also in Seattle and get symmetric gigabit for $49.99 all in, I’d be surprised if they’re getting 480 from comcast for cheaper. I think my provider is only available for apartment buildings but there’s likely competition from other providers that at least offer symmetric speeds.
Dang, assuming you can get the HOA to sign on you might be able to get in with GFiber Webpass or Atlas (I personally have Atlas) since they’re both microwave providers. There’s no fiber to lay so all they need to do is put a dish on top and integrate it into the distribution system.