In my former post, that office was located on Brannan Street. This brings to mind an interesting quote:
Early in 1848, employees of John Sutter paid for goods in his store with gold they had found at Sutter's Mill, near Coloma, California. Brannan went to the mill and, as a representative of the LDS Church, he received the tithes of the LDS workers there from the gold they had found in their spare time. Brannan took this gold back to San Francisco, purchased every shovel in the city, and then ran through the streets yelling, "Gold! Gold! Gold from the American River!"
Brannan opened more stores to sell goods to the miners (his Sutter Fort store sold US$150,000 a month in 1849)