The San Francisco hotel where Data takes a room after being thrown back to 1893, funding his stay with poker winnings and building a detector with help from the bellboy.
The Hotel Brian is a San Francisco hotel seen in the Next Generation two-part story Time's Arrow. Stranded in August 1893 without money, Data joins a poker game with the gambler Frederick La Rouque and others, stakes his combadge and wins enough to pay for a room there.
Presenting himself as a French inventor, he sets about building a device to detect the time shifts of the Devidians. The eager bellboy, Jack, runs errands for him, fetching whatever odd supplies he asks for and hoping to share in the profits of whatever is being invented; he is later revealed to be the young Jack London.
It is from the hotel that Data learns of Guinan's presence in the city through a newspaper, and his room draws the curiosity of Samuel Clemens, who searches it and becomes convinced that visitors from the future mean harm to his era.