https://www.redfin.com/WA/Gig-Harbor/2403-20th-Avenue-Ct-NW-...
Here's a comparable home in Vallejo for 10% more (but an extra bedroom) in Vallejo, which is 30 miles from SF or 25 miles from Berkeley
https://www.redfin.com/CA/Vallejo/9311-Big-Ben-Ct-94591/home...
The home you listed: in Vallejo, which is very undesirable; has $2460/year HOA dues; is in a borderline terrible school district; is on 4200 sq ft lot, with most of the windows blocked due to the neighbors being within normal talking voice distance.
The home I listed: is in Gig Harbor, which is very desirable; in an excellent school district; is on a third of an acre.
In short, the two homes are not at all comparable. For a good comp, you would need to find something in the south bay.
https://www.redfin.com/WA/Gig-Harbor/6010-106th-Ave-NW-98335...
Your 2.5x figure is exaggerated.