Black Mountain Ranch is a young community of 4,500 people encompassing more than 5,100 acres of the City's northern section. Known locally as "BMR," the area 's two major developments are Santaluz in the southern half and Del Sur in the northern half. Featuring a mix of Spanish Colonial and Italian architecture, both areas were planned with San Diego's unique environment and climate in mind. Two out of every three acres in BMR are parks or open space, including Black Mountain Ranch Community Park, which offers grand views of the northern reaches of the City.