Welcome to CALIFORNIA! This Stargate geocache is located outside the Jing Institute martial arts and Chinese cultural academy in San Diego. I've asked the Stargate network to send it on a very long trip to a place from which it can pick up a lot of new states -- the Stargate cache in Framingham, Massachusetts (P4271-S). Happy space travels!
(By the way, for the benefit and edification of future finders, I've discovered that the flag attached to this TB is not the flag of some place in Poland, as I had suspected, but rather, of the German state of Thuringia.)