[1] Before the Sam Brannan House was built, the lot had an 1849 wooden building that was Sacramento's first US post office.

The three-story brick building was built on the lot in 1853, by Henry E. Robinson.

In 1854 the Sacramento Pioneer Association was founded in the Jones Hotel meeting room.

Some of the Sacramento Pioneer Association founding members were: Joseph W. Winans (first president), Mark Hopkins, General Albert Maver Winn, John Sutter, James W. Marshall, J. Neely Johnson, John Bigler, Newton Booth, B. F. Hastings, D. O.

Sacramento Pioneer Association worked on the Sutter's Fort project.

Pioneer Hall built in 1868 is the oldest building in California under continuous ownership of one owner.