Notice the "flags: qr rd ra" line near the top. The absence of an "aa" flag indicates that this is not an authoritative response, which is correct since Google is not CCSF's authoritative server.
The answer is that "rudra3.ccsf.cc.ca.us" is authoritative for CCSF.
Notice the "flags: qr aa rd" section. The "aa" correctly indicates that this is an authoritative response.
The reply has "flags: qr rd ra" -- it is not authoritative!
I tried several domains and I was unable to get any authoritative responses at all at Starbuck's.
I don't know what is causing this, but I suspect that Starbuck's is lying to clients, and redirecting all DNS queries to some sort of caching server no matter who I try to ask.
But the end of the reply says I really used the CCSF server, with address 147.144.3.238.
So it seems that Starbuck's passes responses through a proxy that removes the aa flag. Very strange.