Mare Island Naval Shipyard, Magazine No. 1, Railroad Avenue, west side near Maseda Road, Vallejo, Solano County, CA

Significance: Part of naval complex. Building A1 is a contributing element of the Mare Island Historic District. Building A1 is one of the key elements of the historic Mare Island Naval Shipyard. Its significance is measured in superlatives. It is significant historically as the second oldest building at Mare Island, as the oldest naval magazine facility on the West Coast, and as one of the oldest military buildings anywhere in California. It is also the key building in the Ammunition Depot area of Mare Island, one of the more important functional elements in the operations of the shipyard. Architecturally, Building A1 is the best example of the early sandstone masonry construction used in the Ammunition Depot.
Survey number: HABS CA-1543-B
National Register of Historic Places NRIS Number: 75002103