What is the name of the US city where Levi Strauss began making special clothes?

Levi Strauss & Co. is an American company founded in 1853 by Levi Strauss. He is a well-known manufacturer of clothing (primarily denim) and footwear. First he began his manufacturing in San-Francisco, the USA. Now the owners of the company Levi Strauss & Co. are the heirs of Levi Strauss.