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Designed at a time when Castro Valley’s population was around 50,000, the compact Castro Valley Post Office continues to serve the community. It took years of community lobbying for the $160,000 building to be built on Santa Maria Avenue where two small homes were removed to make way for construction. Before that, mail sent out of Castro Valley’s two small branches on Castro Valley Boulevard (where Rose Motor Cars is now) and an even smaller branch located in the Bellini’s Drug Store at Center Street and Heyer Avenue was routed through the Post Office in Hayward. The opening of the new Post Office was a huge step forward in Castro Valley breaking away from the influence of Hayward. A prime example was the controversial installation of external lettering stating, “United States Post Office; Castro Valley Branch; Hayward, California.” In response to the lettering, the Castro Valley Chamber of Commerce collected 5,000 signatures from residents and traveled to Washington D.C. to advocate the independence of the new Castro Valley branch. The chamber’s effort worked and the building lettering was changed, identifying it as the Castro Valley branch. The new Post Office was dedicated on November 20, 1965, with a huge celebration that featured the Castro Valley High School Band. Despite being 55 years old, it serves Castro Valley with a growing and diverse population of 63,288 residents.