Building 64, Residential building on Alcatraz Island, San Francisco, US.

Building 64 is a three-story apartment block beside the dock on the southeastern side of Alcatraz Island, below the Warden's House. It was built in 1905 on the site of a U.S. Army barracks that had stood there since the 1860s. Its largest apartment, in the southwest corner, was called the "Cow Palace", and a nearby alleyway was known as "Chinatown". A bookstore now occupies the ground floor on the left side.

Built in 1905 on the site of an 1860s U.S. Army barracks, Building 64 was the first structure erected on Alcatraz to house military officers and their families, and it served as the Military Guard Barracks from 1906 to 1933. From 1934, under the federal prison, it decayed while new quarters rose on the Parade Grounds, yet most arriving families stayed here until a room elsewhere opened up. In 1970, during the Occupation of Alcatraz, Native Americans painted red graffiti around the "United States Penitentiary" sign reading "Indians welcome" and "Indian land".

The building's name comes from its number in the military and prison records. Its southwest apartment was nicknamed the "Cow Palace" and the adjoining alley "Chinatown". During the 1970 Occupation, Native Americans painted red graffiti around the "United States Penitentiary" sign reading "Indians welcome" and "Indian land". A bookstore now occupies the ground floor on the left side.

Building 64 stands next to the dock on the southeastern side of Alcatraz Island, below the Warden's House. The ground floor houses a bookstore on its left side. The building is not furnished prison-staff housing and its interior is not open to visitors; it is seen from the dock and the island's exterior paths.

The southwest corner apartment was nicknamed the "Cow Palace", and the alley beside the building was called "Chinatown". During the 1970 occupation, Native American activists painted red graffiti around the "United States Penitentiary" sign reading "Indians welcome" and "Indian land". A bookstore now occupies the ground floor on the left side.