Built originally as the Grammar School Annex in 1917, the building is a Prairie School–style landmark designed by the architectural partnership Stone & Wright. It is distinguished by its richly ornamented Sullivanesque details and buff-colored brick from the Livermore Fire Brick Company.  Additions and renovations in 1928 added second story classrooms.  It began serving as City Hall in 1956, and work in the early 1990s provided seismic and accessibility upgrades while preserving its historic character.  Listed on the National Register of Historic Places, City Hall remains one of Martinez’s most intact and expressive historic structures.

The building’s terracotta details are elaborate motifs inspired by the ornamental style of architect Louis Sullivan, including egg andd art bands, octagonal medallions, and cascading foliate designs. Terracotta ornaments were popular in the early 1900s for their durability, fire resistance, and ability to hold crisp, intricate patterns. Two exterior ornaments were removed during the 1990s building renovations and relocated inside City Hall for preservation and appreciation.

Learn more via the National Register of Historic Places summary:

National Register of Historic Places - Grammar School Annex

Source:

National Park Service. Martinez Grammar School Annex. National Register of Historic Places Registration File, Asset ID d29044d4-0717-430a-96c8-8355ecf965f6. Washington, D.C.: U.S. Department of the Interior. Accessed March 31, 2026. https://npgallery.nps.gov/NRHP/AssetDetail/d29044d4-0717-430a-96c8-8355ecf965f6.