2415 Mission St, San Francisco, California.
The mail drop place is 2417 Mission. 2415 is probably above "Wholesale Fashion Shoes".

This is Jared's "hacker hotel":

20mission "Hacker Hotel" above the T-Mobile store.
Same building, different entrance. Mission St. on the right, 20th St. on the left.

20mission lists Tradehill as a tenant.  That may be where they really are.

Could be worse. PayPal started above Palo Alto Bicycles on University Avenue in Palo Alto.