Looks like the winner for oldest building still standing in Menlo Park is the train station, which now serves Caltrain passengers.
It was constructed in 1867 by the San Francisco and San Jose Railroad Company and is the oldest railroad passenger station in California.
The Victorian ornamentation was added in the 1890s when the station was remodeled to serve the newly-opened Stanford University. The extension on the northwest was added to accommodate increased traffic generated by the establishment of Camp Fremont nearby during World War I.
During the years Southern Pacific ran the trains, steam locomotives chugged into the station until they were replaced by diesel engines in the 1960s. The newest train is the Baby Bullet, introduced in 2004. Photo by Chris Gulker