有
Yes!
Just type map.yahoo.com if you can see it!
http://yp.yahoo.com/py/ypResults.py?stx=Yahoo+Inc.&stp=a&tab=&desc=&city=San+Francisco&state=CA&zip=&uzip=94103&msa=7360&country=us&cs=4&ed=r1drq61o2TwCw_QCe.Ag5tsIPoRML4j2Ybrk0DZ6R1c0sA--
See it in Sunnyvale?
I think it's the base!not the 办事机构.
However, that's it!
参考资料：map.yahoo.com