San Lorenzo's homes and the freeway seen from over the town looking west to the bay and the Peninsula hills

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San Lorenzo, in short

What is San Lorenzo Village?

San Lorenzo Village is the planned community of single-family homes that makes up most of San Lorenzo. The San Lorenzo Village Homes Association counts 5767 single-family homes in it, and the County’s 2004 plan says one developer built them in the 1940s and 1950s. San Lorenzo is not a city, so Alameda County issues its building permits.

The story of San Lorenzo

San Lorenzo, an unincorporated community of Alameda County, most of it a planned community built in the 1940s and 1950s.

San Lorenzo grew from a town the County’s plan dates to 1854 into the planned community of the 1940s that is most of it today, built on farmland, the County’s survey says.

The County’s Eden Area General Plan says the original occupants of the Eden Area were “the Cho-chenyo-speaking Native American tribes”, and that “The primary tribes were the Ohlone or Coastanoan.”

The same plan says, “The County of Alameda was established in 1853 and the town of San Lorenzo was founded in 1854. It was located just north of San Lorenzo Creek at the intersection of Telegraph Road (now Hesperian Boulevard) and Main Street (now Lewelling Boulevard).”

The County’s 2000 survey says of the area’s farming, “Excellent soil conditions, weather, and minimal frost meant crops could be grown year round.” It adds that “Eden Township had the most orchards in the area” and that “cherry trees were particularly abundant.”

The plan describes San Lorenzo as “a small resort town that boasted two fine hotels in addition to the Grove Pavilion, which was a particularly popular regional destination for day trips.”

The Hayward Area Historical Society says, “On May 13, 1893, the line to San Lorenzo officially opened. The San Lorenzo line led to the San Lorenzo Pavilion, where people partied and picnicked on weekends.” It adds that the line “was abandoned in 1927 due to lack of patronage.”

The Oro Loma Sanitary District’s history page says that in 1911 the Board of Supervisors “voted to approve the petition of 29 civic-minded men to create a new sanitary district”, which “would include the new housing tracts and be called Oro Loma.”

The County’s 2000 survey says, “The large fields of San Lorenzo’s farms provided ample open-space for the development of much-needed housing tracts.” It tells how “David D. Bohannon, president of the Bohannon Organization, set out to build a planned model community called San Lorenzo Village on the former site of the H.T. Smyth farmstead.”

The survey says the developer “built a shopping/entertainment center complete with a movie theater (the Lorenzo Theater), restaurants, clothing stores, and a post office.” It adds, “By 1947 nearly half of the northern study area was filled with houses, schools, and commercial buildings.”

The County’s notice of April 2, 2025 says, “USPS implemented these changes in March 2025”, and that San Lorenzo is now among the communities with “the official mailing address Place Names”. The County’s page adds, “Because Castro Valley and San Lorenzo have their own Post Office branches, many addresses in Castro Valley and San Lorenzo already had current Place Names and were not affected.”

Read the full story of San Lorenzo

Fire safety

Station 22 is in San Lorenzo

The Fire Department’s stations page lists “ACFD Station #22” and says, “This fire station houses one engine company and responds to the downtown, residential and business areas of the town of San Lorenzo.”

Page undated; read Nov 3 2026

Station 23 answers the southern edge

The same page says of Station #23: “Located only a few blocks from the Hayward city limits, Station #23 responds to the southernmost parts of San Lorenzo and portions of the unincorporated areas of Hayward.”

Page undated; read Nov 3 2026

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San Lorenzo this month

Storm season: the County’s Public Works Agency says residents of unincorporated Alameda County can get free sandbags at the County’s pickup sites, five per household, once the first major storm of the season is forecast.

The San Lorenzo blog starts when there is enough local news to keep it current.

Culture and history

San Lorenzo Community Park

The Hayward Area Recreation and Park District’s page lists “Baseball / Softball”, “Basketball”, “Lagoon”, “Open Lawn Area”, “Picnic Tables”, “Playground” and “Soccer”, among other features, and the County’s 2010 park table gives the park 31.0 acres.

Page undated; read Nov 3 2026

San Lorenzo Community Center

The park district’s page says, “The facility offers a wide variety of classes, activities, and special interest programs.” It adds, “The facility’s main hall can be rented for special and private events.”

Page undated; read Nov 3 2026

See 6 more
Arroyo Swim Center

The park district runs it; its page says it “features a six-lane, 25-yard outdoor lap pool ranging from 3.5 to 12 feet deep, and a small pool with a maximum depth of 3 feet.”

Page undated; read Nov 3 2026

San Lorenzo Library

The Alameda County Library’s page for the San Lorenzo branch lists a “Civics Corner”, a “Community Language Collection”, a “Community Display Case” and a “Park/Playground”. The County’s Eden Area plan says the library “was built in 1969”.

Page undated; read Nov 3 2026

A planned model community

The County’s 2000 survey says a developer “set out to build a planned model community called San Lorenzo Village on the former site of the H.T. Smyth farmstead”. More in The story of San Lorenzo, below.

Survey is a November 2000 draft; history only

A small resort town

The County’s Eden Area plan calls San Lorenzo, in its early days, “a small resort town that boasted two fine hotels”. More in The story of San Lorenzo, below.

A fire department of its own

The Fire Department’s stations page says Station #22 “was the original fire station for the San Lorenzo Village Fire Department” before the 1976 consolidation. More in The story of San Lorenzo, below.

Page undated; read Nov 3 2026

Orchards

The County’s 2000 survey says “cherry trees were particularly abundant” in the area. More in The story of San Lorenzo, below.

Survey is a November 2000 draft; history only

Community

San Lorenzo Village Homes Association

The County’s Eden Area plan names it with the Ashland Community Association and the Cherryland Community Association as “Neighborhood Associations”.

The plan is an older document (adopted March 2010)

Hayward Area Historical Society

The Society’s subjects list has a San Lorenzo entry, with pages titled “Building San Lorenzo Village” and “San Lorenzo Pioneer Cemetery”.

Page read Nov 3 2026

City rules and regulations

Building permits come from the County

The County’s permit portal has a page headed “Building Permits – Serving Alameda County’s Unincorporated Areas”, and it names San Lorenzo: “(Community incl. Ashland, Castlewood, Castro Valley, Cherryland, Fairview, Happy Valley, Hillcrest Knolls, San Lorenzo, and Sunol)”. For fees, the County’s Permit Resources page lists a “Building Permit Fee Schedule – Schedule A”.

Page undated; read Nov 3 2026

Village homes: ask the Association before exterior work

The County’s 2004 plan says the Village’s homes “are subject to the rules of the San Lorenzo Village Homes Association”. The Association’s Policies and Forms page lists an “Exterior Alteration Policy” and an “Exterior Alteration Approval Procedure”, so ask the Association before exterior work.

Association page read in Chrome Nov 3 2026; the 2004 plan is an older document

See 3 more
Pruning a tree in the street right-of-way needs a permit

The County’s Public Works page says street trees and other trees in the public right-of-way are protected by the “Tree Ordinance (number O-2016-66)” and overseen by the “Public Works Agency’s Tree Program”. It adds, “Property owners are responsible for maintaining trees within county road right of way.” And: “Permits must be obtained before pruning trees in any right-of-way areas.” The page also says, “Trimming branches that are less than one inch in diameter does not require a permit.”

Page undated; read Nov 3 2026

When you buy or sell A sewer lateral certificate before a sale

Inside the Oro Loma Sanitary District, a home needs a valid sewer lateral compliance certificate before the title transfers. The District’s page says, “The ordinance applies to property sales that enter into escrow on or after August 1, 2026.” It links a map for checking whether an address is inside the District.

Page undated; read Nov 3 2026

When you buy or sell How the certificate works

The District’s page says to apply for a Certificate of Compliance and “hire a qualified professional to perform a CCTV inspection and an air or water test on the sewer lateral”. It says, “Certificates are valid for up to 10 years or 20 years (full replacement).”

Page undated; read Nov 3 2026

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Storms, flood and drainage

Free sandbags from the County

The Public Works Agency’s page says, “The Alameda County Public Works Agency has free sandbags available for residents of the unincorporated Alameda County only.” They are “available 24 hours a day, 7 days a week outside of the corporation yard gates at the locations below, and are made available upon forecast of the first major storm of the season.” The page adds, “Please bring your own shovel and a way to transport bags.” and “Sandbags are limited to five (5) per household.” Its list of pickup sites names none in San Lorenzo, and the nearest it lists is in Hayward, so look at the list before you go.

Page undated; read Nov 3 2026

The County’s list for getting a home ready for a storm

The same Public Works page lists, among its steps: “Clean your rain gutters, storm drains and downspouts from leaves and debris”, “Direct downspouts away from your foundation” and “Inspect your roof, drainage systems & sump pump, and make necessary repairs”. That is the County’s advice, not a rule.

Page undated; read Nov 3 2026

See 2 more
Where the water goes

The Flood Control District’s page on the Bockman Canal says the waterways of its watersheds “flow entirely through underground culverts and engineered channels to drain the low lying areas of San Lorenzo and the northwest section of Hayward”, and that “Bockman Canal drains the western portion of San Lorenzo”.

Page read Nov 3 2026

Check a flood map for your address

FEMA’s community status book lists a current effective flood map for Alameda County’s unincorporated areas dated 05/26/26. Which flood zone applies at one address is for FEMA’s flood map service.

Status book refreshed Aug 25 2026, pulled Nov 1 2026

Need a hand with this? Gutter cleaning

Programs, loans and insurance

County-wide Minor Home Repair Program (Healthy Homes)

The Alameda County Healthy Homes Department’s Homeowner Minor Home Repair Program, its page says, serves “the cities of Albany, Dublin, Emeryville, Oakland, Newark, Union City, and the unincorporated areas of Ashland, Cherryland, Castro Valley, Hayward Acres, Hillcrest Knolls, Fairview, San Lorenzo, and Sunol”. You need “a household income at or below the HUD income limits”. The page calls it a grant and says it can be used “to make minor plumbing, carpentry, electrical repairs and can be used for railings, grab bars, toilets, water heaters, doors, locks and more”; it names no roof or gutter item. Services are “available only once in a two year period”, and the page says, “To apply for a minor home repair grant, call 510-567-8280.”

Program page read Nov 3 2026

County-wide Habitat for Humanity home repair

Habitat for Humanity East Bay/Silicon Valley’s Home Repair page lists San Lorenzo in its city menu for Alameda County. Under “Critical Repairs” it lists “roof repairs, upgrading electrical systems, replumbing, flooring replacement, replacing windows”, and it says, “All home repairs are performed by licensed contractors and overseen by our skilled construction staff.” It describes the program as preserving homeownership for “low-income residents”, and the first step is to “Submit a Request for Service form online or by mail below.”

Program page read Nov 3 2026

See 9 more
County-wide Check back Renew Alameda County home improvement loans: check back

The program’s eligible-repairs page lists “Re-roofing and gutter replacement” and “Property Drainage Improvements” among the repairs its funds may apply to. Its qualifications page asks that you “Own and live in an insured Alameda County home”, and it does not list the cities of its “20-city territory”. The program’s home page says, “Renew Alameda County’s application is currently closed, but you can still join the interest list.”

Program pages read Nov 3 2026

County-wide Check back Diablo Firesafe Council cost-share: check back

The Council’s cost-share page says, “Up to $3,500 of cost-share funds is available to reduce your fire risk.” Its notice dated May 2025 says, “DFSC has temporarily closed the applications for the Partners in Wildfire Prevention fuel reduction grant match. No new applications can be submitted at this time.” The page says the Council “may assist Alameda County or Contra Costa County property owners with vegetation management projects that will lead to compliance with their local fire department’s defensible space requirements in areas designated as Priority Hazard Zones”; it names no roof or gutter item.

Program page read Nov 3 2026; the notice on it is dated May 2025

State-wide Check back California Safe Homes: check back

California Safe Homes, the State’s home-hardening grant program run through the Department of Insurance, is not open: no dated State page says it is, and the Department’s 2026 press-release index lists no Safe Homes item.

Press-release index read Nov 3 2026

County-wide Low-income weatherization (Spectrum Community Services)

Spectrum Community Services runs a federally funded weatherization program; its page says applicants must “Live in Alameda County.” and “Own the residence or get approval from the owner for weatherization services.” It offers “Heater, water heater, and weatherization services every five years.”, and its list of what it can provide includes “Attic and Floor Insulation” and “Window and Exterior Door Repair or Replacement”, with no roof or gutter item. The page was last updated December 30, 2025, and gives no open or closed word.

Program page read Nov 3 2026

County-wide LIHEAP, help with energy bills

Spectrum Community Services’ LIHEAP page says, “LIHEAP is a federally-funded program to help households experiencing low income pay their energy bills.” The page gives no deadline and no open or closed word for applications.

Program page read Nov 3 2026

County-wide BayREN EASE Home

BayREN’s EASE Home page says, “BayREN covers 80% of the cost for essential weatherization upgrades, including insulation and duct sealing.” Its conditions include “Live in a single-family home (four or fewer units) built before 2010.” and “Are a PG&E customer.” The page’s county list includes Alameda.

Program page read Nov 3 2026

County-wide Lead hazard repair (Healthy Homes)

The Alameda County Healthy Homes Department’s page says, “Lead Hazard Repair grants are available for owners of pre-1960 rental and owner-occupied residential properties throughout Alameda County. Income, occupancy and other eligibility requirements apply.”

Program page read Nov 3 2026

Check back Earthquake Brace + Bolt: check back

Earthquake Brace + Bolt is a program of the California Residential Mitigation Program, a joint body, not a State program. The program’s Northern California ZIP list shows San Lorenzo with 94580. The program’s page says, “An EBB seismic retrofit is only done on wood-framed, pre-1980 homes with a raised foundation.” and “EBB program registration is open for a limited time each year.” Its registration page, read in Chrome on Oct 20 2026, said, “The EBB Program is currently closed.”

Registration page read Oct 20 2026; read it again before use

Oro Loma Sanitary District: bulky pickups

The District’s bulky-collection page says, “Get Two Free Bulky Pickups per Calendar Year!” and, “Oro Loma Sanitary District customers are allowed two bulky waste pickups per year.”

Page undated; read Nov 2 2026

Who serves your home in San Lorenzo

  • Fire: The Alameda County Fire Department, which says it provides “all-risk emergency services to the unincorporated areas of Alameda County (excluding Fairview)”.
  • Sewer: The Oro Loma Sanitary District; its home page says “Our service area includes San Lorenzo, Ashland, Cherryland, Fairview, and portions of the City of San Leandro, the City of Hayward, and Castro Valley.”
  • Garbage: The Oro Loma Sanitary District also oversees garbage and recycling; its Solid Waste page says, “Oro Loma has contracted WM to provide these services.”
  • Water: The East Bay Municipal Utility District; its service-area page says the area “extends from Crockett on the north, southward to San Lorenzo” and lists no individual places.
  • Electricity: Ava Community Energy; its page for Alameda County says the County set it up “to offer unincorporated Alameda County (including Ashland, Castro Valley, Cherryland, Fairview, San Lorenzo, and Sunol) businesses and residents cleaner energy”.
  • Flood control: The Alameda County Flood Control and Water Conservation District; its watershed page says the San Lorenzo Creek watershed “incorporates the unincorporated communities of San Lorenzo, Ashland, Cherryland, Fairview, and Castro Valley”.
  • Permits: Alameda County issues the building permits for San Lorenzo through its permit portal, because San Lorenzo is not a city.
  • Parks: The Hayward Area Recreation and Park District; its page says its boundaries include “the City of Hayward and the unincorporated communities of Castro Valley, San Lorenzo, Ashland, Cherryland, and Fairview”.

The homes of San Lorenzo

San Lorenzo’s median year built is 1955, and about two homes in three, 67.1 percent, were built in the 1940s and 1950s. About 78.3 percent are single-family houses on their own lot, detached, our own calculations from the Census Bureau’s 2020-2024 survey tables.

The 1940s and 1950s

The planned Village

The County’s 2004 plan says the Village was “built in the 1940’s and 1950’s”. The Census Bureau’s 2020-2024 survey counts about 3,709 homes built in the 1950s and about 2,203 in the 1940s, the two largest decades, our own comparison.

Before 1940

Older town blocks

The County’s 2000 survey finds “two concentrations of properties from 1880 to 1920”. The Census Bureau’s survey counts about 512 homes built in 1939 or earlier, about 5.8 percent of all homes, our own calculation.

1960 to today

Newer homes

About 27.1 percent of San Lorenzo’s homes were built in 1960 or later, and about 2.0 percent in 2010 or later, our own calculations from the Census Bureau’s 2020-2024 survey tables.

Older roofs and gutters need a different hand: Gutter Repair · Roof Repair · Gutter Installation

The story of San Lorenzo

History and character

The County’s Eden Area General Plan says the original occupants of the Eden Area were “the Cho-chenyo-speaking Native American tribes”, and that “The primary tribes were the Ohlone or Coastanoan.”

The same plan says, “The County of Alameda was established in 1853 and the town of San Lorenzo was founded in 1854. It was located just north of San Lorenzo Creek at the intersection of Telegraph Road (now Hesperian Boulevard) and Main Street (now Lewelling Boulevard).”

The County’s 2000 survey says of the area’s farming, “Excellent soil conditions, weather, and minimal frost meant crops could be grown year round.” It adds that “Eden Township had the most orchards in the area” and that “cherry trees were particularly abundant.”

The plan describes San Lorenzo as “a small resort town that boasted two fine hotels in addition to the Grove Pavilion, which was a particularly popular regional destination for day trips.”

The Hayward Area Historical Society says, “On May 13, 1893, the line to San Lorenzo officially opened. The San Lorenzo line led to the San Lorenzo Pavilion, where people partied and picnicked on weekends.” It adds that the line “was abandoned in 1927 due to lack of patronage.”

The Oro Loma Sanitary District’s history page says that in 1911 the Board of Supervisors “voted to approve the petition of 29 civic-minded men to create a new sanitary district”, which “would include the new housing tracts and be called Oro Loma.”

The County’s 2000 survey says, “The large fields of San Lorenzo’s farms provided ample open-space for the development of much-needed housing tracts.” It tells how “David D. Bohannon, president of the Bohannon Organization, set out to build a planned model community called San Lorenzo Village on the former site of the H.T. Smyth farmstead.”

The survey says the developer “built a shopping/entertainment center complete with a movie theater (the Lorenzo Theater), restaurants, clothing stores, and a post office.” It adds, “By 1947 nearly half of the northern study area was filled with houses, schools, and commercial buildings.”

The County’s notice of April 2, 2025 says, “USPS implemented these changes in March 2025”, and that San Lorenzo is now among the communities with “the official mailing address Place Names”. The County’s page adds, “Because Castro Valley and San Lorenzo have their own Post Office branches, many addresses in Castro Valley and San Lorenzo already had current Place Names and were not affected.”

San Lorenzo, roof and gutters

The County’s Eden Area General Plan, adopted in March 2010, says the San Lorenzo community “is the largest of the Eden Area communities in size and extends beyond San Lorenzo Creek on the north, to the Union Pacific Railroad tracks on the east, Bartlett Avenue and the Skywest Public Golf Course on the south, and the San Francisco Bay and the tidelands on the west.” Of the Eden Area as a whole the plan says, “Much of the terrain is flat or gently sloped.”

Yearly rain averages about 17.34 inches at the two nearest federal weather stations, Hayward Air Terminal (16.00 inches, 1.66 miles away) and Oakland Metro (18.68 inches, 5.82 miles away), by NOAA’s 1991-2020 normals and our own calculation, measured from the Census Bureau’s center point for San Lorenzo. November through April brings about 89 percent of the year’s rain at Hayward and 90 percent at Oakland, and June through September together bring about a third of an inch at each, our own calculation too.

The County’s tree-canopy table, which cites a vegetation map dated 4/1/2023, puts San Lorenzo’s tree canopy cover, the share of the ground the tree crowns cover when seen from above, at 12 percent, against 22 percent for unincorporated Alameda County as a whole.

Before the rains is the easy time to get leaves and other debris off a San Lorenzo roof and out of its gutters. If yours hasn’t been cleared in a while, we’d be glad to come by.

Landmarks and parks

Lorenzo Theater
The State’s list of historical resources for Alameda County has it at San Lorenzo, registered 2/10/2000, in its California Register column. The County’s directory describes “A good example of theater architecture in the Moderne Style, constructed in 1947”.

San Lorenzo Pioneer Cemetery
The Hayward Area Historical Society says the first recorded burial at the cemetery on Hesperian Boulevard and College Street was in 1854, and that it was later “officially dedicated as the San Lorenzo Pioneer Memorial Park, honoring early pioneers of the area.”

San Lorenzo Community Church
The County’s 2000 survey says it was “built as a chapel for Camp Parks, California”, moved to the Village in 1947, and “is made of three quonset huts”.

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  • We keep track of local regulations, fire safety rules and insurance programs
  • We show you what we found, with photos, so you decide what happens next

The year in San Lorenzo

FebruaryStill 3.11 and 3.51 inches, the next-highest normals after December at both stations
AprilDown to 1.20 and 1.35 inches, the last month of the wet season
JulyNo rain in the normals, 0.00 inches at both stations
OctoberThe first real rain of the season: 0.81 inches at Hayward Air Terminal and 0.88 at Oakland Metro, against 0.08 and 0.10 in September (NOAA’s 1991-2020 monthly normals)
NovemberThe monthly normal climbs to 1.51 inches at Hayward Air Terminal and 2.02 at Oakland Metro
DecemberThe wettest month at both stations: 3.20 inches at Hayward Air Terminal and 3.84 at Oakland Metro

San Lorenzo questions

What San Lorenzo homeowners ask us

Where do I get a building permit for a new roof in San Lorenzo?

From Alameda County. San Lorenzo is not a city, so there is no city building department. The County’s Public Works Agency says to “Apply for building permits, submit plans, schedule inspections and check permit status through the Alameda County Permit Portal.” If you wish, we can also pull the permit for you, as most of our customers ask us to.

Can my roof downspout drain into the sewer in San Lorenzo?

No, not in the Oro Loma Sanitary District, whose service area includes San Lorenzo. The District’s posted sewer-connections ordinance says “No roof downspouts, exterior foundation drains, areaway drains, or other sources of surface runoff, or groundwater, can be connected to any building drain, building sewer, or collector sewer that is connected directly, or indirectly, to a public sewer.” The District’s map shows whether an address is inside its service area.

I am selling a home in San Lorenzo: do I need a sewer lateral certificate?

Yes, if the home is inside the Oro Loma Sanitary District, whose pages name San Lorenzo in its service area. The District’s page says, “Effective August 1, 2026, all properties sold within the Oro Loma Sanitary District must have a valid Sewer Lateral Compliance Certificate prior to transfer of title”.

Do I need a County permit to prune or remove a tree on my own property in San Lorenzo?

Generally no, the County’s planning page says: “There are currently no countywide ordinances regulating trees on private property in unincorporated Alameda County. Generally, property owners in unincorporated Alameda County can plant, prune, and remove trees on their own property without a permit from the County.” The one private-tree rule the page names, a view-and-sunlight ordinance, is for Fairview only.

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We usually respond promptly within the day. Phone first for emergencies: (510) 525-0880.

Where we work

San Lorenzo neighbourhoods we serve

Map of San Lorenzo and the places around it
Map: boundaries from the U.S. Census Bureau
Map of San Lorenzo and the places around it
Map: boundaries from the U.S. Census Bureau

San Lorenzo Village
The County’s Eden Area General Plan calls it “a 1940s planned development of small homes to the west of Hesperian Boulevard”.

San Lorenzo Village Center
The County’s 2004 plan says the old shopping center, with the library, post office and community hall beside it, “functioned much as a traditional downtown and was viewed as the center of civic life.”

Four Corners
The County’s plan puts it at “the intersection of Hesperian and Lewelling” and calls it “the historic center of the Eden Area”.

Grant Avenue Industrial Area
The County’s plan calls it the Eden Area’s one “Special Precinct”, “at the western end of the San Lorenzo community”, between the homes and the Bay.

Eden Area
The County’s page says, “The western part of the unincorporated areas of Alameda County is known as the Eden Area.”

Also serving nearby: Hayward · San Leandro · Cherryland · Ashland