This cache will not be found at the posted coordinates (nor is it affiliated, in any way, with catomcat).
After several years in a temporary building, the town of Atherton has a new library somewhere; in fact, it is at the same location as the old library. This cache is a short distance away to avoid conflict with existing caches in the neighborhood.
The following keywords should help you identify the final location, which is somewhere (you probably saw that coming) within N37 and W122.
Mosaic bridge reef suspicious society coin gold coral forbidden across.
The cache is not to be found over the rainbow, and it is definitely not greener on the other side.
Approach GZ only from the parking lot.
You can validate your puzzle solution with certitude.
If you haven't visited this area before, check out the neighboring GC55ZZJ; GC5G99K and GC9V41M are now archived.