San Lorenzo (Spanish for "Saint Laurence") is a census-designated place (CDP) located in the East Bay of the San Francisco Bay Area in Alameda County, California, United States.

[7] In 1944, under contract to the U.S. Navy, The David D. Bohannon Company began construction of San Lorenzo Village, which was one of the nation's first planned communities, with parcels designated for schools, churches, parks, and several retail centers.

Bohannon's pioneering pre-cutting techniques, referred to as the "California method,"[8] were used in later developments, such as the more famous Levittown, Pennsylvania.

In 1944, under contract to the U.S. Navy, The David D. Bohannon Company began construction of San Lorenzo Village, a tract of two- and three-bedroom homes for workers in the East Bay's war industries.

San Lorenzo Village was one of the nation's first planned communities, with parcels designated for schools, churches, parks, and several retail centers.

Bohannon's pioneering pre-cutting techniques, referred to as the "California method," were used in later developments, such as the more famous Levittown, Pennsylvania.

[14] These restrictions, among others around fencing and house colors, were enforced by the San Lorenzo Village Association.

[15] Legal enforcement of such covenants was deemed to violate the Equal Protection Clause of the Fourteenth Amendment by the Supreme Court in Shelley v. Kraemer (1948), meaning that while parties could choose to abide by the covenants, they could no longer be legally used to prevent non-white persons from buying properties with such restrictions.

As a general note, without specific reference to San Lorenzo, after Shelley, homeowners associations still would bar non-white owners by requiring membership in the association before buying property, and federal and state governments refused to enforce the Shelley decision.

[16] In San Lorenzo, the black population remained under one-half percent in the early 1970s.

It is located between the incorporated cities of San Leandro to the north and Hayward to the south.

The 2010 United States Census[19] reported that 23,452 people, 7,425 households, and 5,792 families resided in the CDP.

San Lorenzo is an unincorporated community and thus is governed directly by the County of Alameda.