Mare Island Naval Shipyard, Magazine No. 2, Railroad Avenue, west side near intersection with Imhoff Road, Vallejo, Solano County, CA

Significance: Building A20 is a contributing element of the Mare Island Historic District. Building A20 is a key element of the Ammunition Depot area of Mare Island. It represents a second generation of magazine construction there, built more than a decade after Buildings A1 and A3. The chiseled sandstone ashlar reflect the continuing tradition of fine stone masonry involved with construction of the early magazines at Mare Island, used in Building A1 in 1857 and in this building in 1870.
Survey number: HABS CA-1543-CM
National Register of Historic Places NRIS Number: 75002103