The neighborhood of Boyle Heights has one of the most diverse and oldest histories of any neighborhood in Los Angeles. As a part of the original Spanish land grant that established the city in 1781, Boyle Heights was one of the first neighborhoods to develop outside of Downtown Los Angeles. The community has a storied history, serving as a home for Russian, Jewish, Japanese, and Mexican immigrants. The Chicago Building, site of the Boyle Heights City Hall and the Council District 14 Field Office, is part of that history, as it served as the home for the Community Service Organization (CSO), the labor organization established by César Chávez and Dolores Huerta.