 Carlson Boulevard is the main thoroughfare through the annex, connecting downtown Richmond with downtown El Cerrito.In the segment of San Pablo Avenue that forms the boundary between Richmond and El Cerrito, the buildings on the western side (which are in Richmond Annex) have an El Cerrito postal address and their occupants are sometimes mistakenly described as being in El Cerrito, such as Arhoolie Records.According to a local history written down by Fay Breneman circa 1941, "The land now known as Richmond Annex was farmed by the Conlon Brothers."