1) A rooming house for sailers as built on the deck in 1855 (by that time landfill had filled in the surroundings), and in 1859 this was torn down and replaced by a brick hotel, with a bar that continued under the name of The Old Ship Saloon. The hotel was destroyed in the great earthquake in 1906, and the current building was constructed in the space in 1907.
Despite being able to trace its history to 1851 in some sense, given that it neither consistently retained the name nor is located in the same physical structure, I do not count it as quite the oldest bar in San Francisco (see my entry on The Saloon for a discussion). But it is nice to see that recent owners have restored the old name and revived the history with various old photos and artifacts on the exposed brick walls. The saloon now serves pretty typical cafe/pub food and drinks to a white collar working crowd.
Est. 1851 - Building constructed: 1907
Previous bars in this location: Bricks
Web site: oldshipsaloon.com
Reviews: examiner - sfgate - Attitude Adjustment Hour video - insidebayarea - thrillist - yelp - sfexaminer - atlastobscura