The late-Victorian-era Downtown of Los Angeles in 1880 was centered at the southern end of the Los Angeles Plaza area, and over the next two decades, it extended south and west along Main Street, Spring Street, and Broadway towards Third Street. Most of the 19th-century buildings no longer exist, surviving only in the Plaza area or south of Second Street. The rest were demolished to make way for the Civic Center district with City Hall, numerous courthouses, and other municipal, county, state and federal buildings, and Times Mirror Square. This article covers that area, between the Plaza, 3rd St., Los Angeles St., and Broadway, during the period 1880 through the period of demolition (1920s–1950s).

El Pueblo de Los Ángeles Historical Monument, also known as Los Angeles Plaza Historic District and formerly known as El Pueblo de Los Ángeles State Historic Park, is a historic district taking in the oldest section of Los Angeles, known for many years as El Pueblo de Nuestra Señora la Reina de los Ángeles del Río de Porciúncula. The district, centered on the old plaza, was the city's center under Spanish (1781–1821), Mexican (1821–1847), and United States rule through most of the 19th century. The 44-acre park area was designated a state historic monument in 1953 and listed on the National Register of Historic Places in 1972.