Mare Island Naval Shipyard, Rubber Shop, California Avenue, west side across from Dry Dock 1 near Ninth Street, Vallejo, Solano County, CA

Significance: Building 50 is a contributing element of the Mare Island Historic District. Built in 1871, it is a key component of a cluster of brick industrial buildings located at the core of the historic shipyard. It is a structural and visual link between the 1856 Building 46 (the oldest remaining building at Mare Island) and the 1873 Building 52. These three buildings form the waterfront facade for this complex, collectively forming one of the most important streetscapes among historic military and industrial buildings in California.
Survey number: HABS CA-1543-BN
National Register of Historic Places NRIS Number: 75002103