San Mateo, CA Facts, Population, Income, Demographics, Economy

Population (total): Population in 2017: 104,748 (100% urban, 0% rural). >Population change since 2000: +13.3%

Population (female): 52,915

Median Age: 38.7 years

Median Rent: Median gross rent in 2017: $2,480.

Cost of Living: March 2019 cost of living index in San Mateo: 175.0 (very high, U.S. average is 100)

Poverty (overall): Percentage of residents living in poverty in 2017: 9.5%

Poverty (breakdown): (5.1% for White Non-Hispanic residents, 9.2% for Black residents, 15.9% for Hispanic or Latino residents, 7.3% for American Indian residents, 9.8% for Native Hawaiian and other Pacific Islander residents, 19.4% for other race residents, 5.0% for two or more races residents)

In 1810 Coyote Point was an early recorded feature of San Mateo. Beginning in the 1850s, some wealthy San Franciscans began building summer or permanent homes in the milder mid-peninsula. While most of this early settlement occurred in adjacent Hillsborough and Burlingame, a number of historically important mansions and buildings were constructed in San Mateo.[citation needed]

Goldribbon

Recognitions and Certifications

Accredited Drug Testing has been recognized as one of the "Top 10 drug testing companies" for excellent customer service and we have received TPA Accreditation from the National Drug and Alcohol Screening Association. We are active in all drug testing industry associations and our staff are trained and certified as drug and alcohol testing specialists.

Important Links

National Drug and Alcohol Screening Association (https://ndasa.com/)

National Drug Free Workplace Alliance (https://www.ndwa.org/)

Substance Abuse Program Administrators Association (https://www.sapaa.com/)

Substance Abuse Mental Health Safety Administration (https://www.samhsa.gov/)

US Drug Enforcement Administration (https://www.dea.gov/)

Office of Drug alcohol Policy Control (https://www.transportation.gov/odapc)

San Mateo, California Drug Testing

California Drug And Alcohol Testing1

San Mateo, California Drug and Alcohol Testing

Accredited Drug Testing Inc (ADT) offers San Mateo drug testing, San Mateo alcohol testing and San Mateo DNA testing at many locations in the San Mateo, CA area for employers and individuals in need of a drug, alcohol or DNA test. In addition, most San Mateo Drug Testing locations are within minutes of your home or office. Testing locations are open for DOT and NON-DOT drug and alcohol testing.

Testing locations do not accept payment and require a test registration/donor pass to conduct a drug, alcohol or DNA test. You must call (800) 221-4291 to register or online for the test. No appointment is needed, but a test registration is required.

San Mateo Drug Testing locations

60 N EL CAMINO REAL 1.1 miles

60 N EL CAMINO REAL
SAN MATEO, CA 94401
Categories: SAN MATEO CA

222 W 39TH AVE 2.7 miles

222 W 39TH AVE
SAN MATEO, CA 94403
Categories: SAN MATEO CA

1860 EL CAMINO REAL STE 400 3.5 miles

1860 EL CAMINO REAL STE 400
BURLINGAME, CA 94010
Categories: BURLINGAME CA

1098 FOSTER CITY BLVD, STE 102 3.8 miles

1098 FOSTER CITY BLVD, STE 102
FOSTER CITY, CA 94404
Categories: FOSTER CITY CA

1501 TROUSDALE DR 3.8 miles

1501 TROUSDALE DR
BURLINGAME, CA 94010
Categories: BURLINGAME CA

1663 ROLLINS RD 3.9 miles

1663 ROLLINS RD
BURLINGAME, CA 94010
Categories: BURLINGAME CA

125 SHOREWAY RD STE A 4.5 miles

125 SHOREWAY RD STE A
SAN CARLOS, CA 94070
Categories: SAN CARLOS CA

1100 Laurel Street, Suite F 5.9 miles

1100 Laurel Street, Suite F
San Carlos, CA 94070
Categories: San Carlos CA

170 ALAMEDA DE LAS PULGAS 6.9 miles

170 ALAMEDA DE LAS PULGAS
REDWOOD CITY, CA 94062
Categories: REDWOOD CITY CA

801 TRAEGER AVE Ste 212 7.0 miles

801 TRAEGER AVE Ste 212
SAN BRUNO, CA 94066
Categories: SAN BRUNO CA

3 S LINDEN AVE 7.7 miles

3 S LINDEN AVE
SOUTH SAN FRANCISCO, CA 94080
Categories: SOUTH SAN FRANCISCO CA

1400 VETERANS BLVD FL 1 7.7 miles

1400 VETERANS BLVD FL 1
REDWOOD CITY, CA 94063
Categories: REDWOOD CITY CA

International Terminal Level 3 A Side 8.6 miles

International Terminal Level 3 A Side
SAN FRANCISCO, CA 94128
Categories: SAN FRANCISCO CA

1900 SULLIVAN AVE 11.5 miles

1900 SULLIVAN AVE
DALY CITY, CA 94015
Categories: DALY CITY CA

On-site only 11.9 miles

On-site only
San Francisco, CA 94124
Categories: San Francisco CA

SFIA Terminal 2 11.9 miles

SFIA Terminal 2
San Francisco, CA 94125
Categories: San Francisco CA

300 PASTEUR DR 12.0 miles

300 PASTEUR DR
PALO ALTO, CA 94304
Categories: PALO ALTO CA

795 EL CAMINO REAL 12.3 miles

795 EL CAMINO REAL
PALO ALTO, CA 94301
Categories: PALO ALTO CA

26250 INDUSTRIAL BLVD STE 32 12.7 miles

26250 INDUSTRIAL BLVD STE 32
HAYWARD, CA 94545
Categories: HAYWARD CA

1555 DOOLITTLE DR STE 180 12.8 miles

1555 DOOLITTLE DR STE 180
SAN LEANDRO, CA 94577
Categories: SAN LEANDRO CA

2587 MERCED ST 13.0 miles

2587 MERCED ST
SAN LEANDRO, CA 94577
Categories: SAN LEANDRO CA

29000 HESPERIAN BLVD 13.5 miles

29000 HESPERIAN BLVD
HAYWARD, CA 94545
Categories: HAYWARD CA

3555 WHIPPLE RD 13.6 miles

3555 WHIPPLE RD
UNION CITY, CA 94587
Categories: UNION CITY CA

27200 CALAROGA AVE 13.8 miles

27200 CALAROGA AVE
HAYWARD, CA 94545
Categories: HAYWARD CA

3555 CESAR CHAVEZ 13.8 miles

3555 CESAR CHAVEZ
SAN FRANCISCO, CA 94110
Categories: SAN FRANCISCO CA

401 ROLAND WAY STE 205 13.9 miles

401 ROLAND WAY STE 205
OAKLAND, CA 94621
Categories: OAKLAND CA

2111 Whitehall Place, Suite D 14.1 miles

2111 Whitehall Place, Suite D
Alameda, CA 94501
Categories: Alameda CA

7901 OAKPORT ST STE 4950 2ND FLOOR 14.2 miles

7901 OAKPORT ST STE 4950 2ND FLOOR
OAKLAND, CA 94621
Categories: OAKLAND CA

7817 OAKPORT ST 14.3 miles

7817 OAKPORT ST
OAKLAND, CA 94621
Categories: OAKLAND CA

2421 ENCINAL AVE STE A 14.5 miles

2421 ENCINAL AVE STE A
ALAMEDA, CA 94501
Categories: ALAMEDA CA

13939 E 14TH ST 14.5 miles

13939 E 14TH ST
SAN LEANDRO, CA 94578
Categories: SAN LEANDRO CA

2 CONNECTICUT ST STE 1 14.6 miles

2 CONNECTICUT ST STE 1
SAN FRANCISCO, CA 94107
Categories: SAN FRANCISCO CA

35500 DUMBARTON CT 15.0 miles

35500 DUMBARTON CT
NEWARK, CA 94560
Categories: NEWARK CA

2198 15th St, 15.2 miles

2198 15th St,
San Francisco, CA 94114
Categories: San Francisco CA

Castro & Duboce St, South Tower Ste 160A 15.3 miles

Castro & Duboce St, South Tower Ste 160A
SAN FRANCISCO, CA 94114
Categories: SAN FRANCISCO CA

24326 MISSION BLVD STE 3 15.3 miles

24326 MISSION BLVD STE 3
HAYWARD, CA 94544
Categories: HAYWARD CA

24 WILLIE MAYS PLZ 15.3 miles

24 WILLIE MAYS PLZ
SAN FRANCISCO, CA 94107
Categories: SAN FRANCISCO CA

33077 ALVARADO NILES RD 15.6 miles

33077 ALVARADO NILES RD
UNION CITY, CA 94587
Categories: UNION CITY CA

505 PARNASSUS AVE Ste 896 15.6 miles

505 PARNASSUS AVE Ste 896
SAN FRANCISCO, CA 94143
Categories: SAN FRANCISCO CA

601 VAN NESS AVE Ste 2008 15.9 miles

601 VAN NESS AVE Ste 2008
SAN FRANCISCO, CA 94102
Categories: SAN FRANCISCO CA

33560 ALVARADO NILES RD 16.0 miles

33560 ALVARADO NILES RD
UNION CITY, CA 94587
Categories: UNION CITY CA

20400 Lake Chabot Rd Ste 101, 16.0 miles

20400 Lake Chabot Rd Ste 101,
Castro Valley, CA 94546
Categories: Castro Valley CA

580 MARKET ST STE 100 16.2 miles

580 MARKET ST STE 100
SAN FRANCISCO, CA 94104
Categories: SAN FRANCISCO CA

384 EMBARCADERO W 16.3 miles

384 EMBARCADERO W
OAKLAND, CA 94607
Categories: OAKLAND CA

900 HYDE ST 16.4 miles

900 HYDE ST
SAN FRANCISCO, CA 94109
Categories: SAN FRANCISCO CA

26 CALIFORNIA ST 16.4 miles

26 CALIFORNIA ST
SAN FRANCISCO, CA 94111
Categories: SAN FRANCISCO CA

49 DRUMM ST 16.4 miles

49 DRUMM ST
SAN FRANCISCO, CA 94111
Categories: SAN FRANCISCO CA

2201 Post St, 16.5 miles

2201 Post St,
San Francisco, CA 94115
Categories: San Francisco CA

2300 SUTTER ST STE 102 16.6 miles

2300 SUTTER ST STE 102
SAN FRANCISCO, CA 94115
Categories: SAN FRANCISCO CA

2290 W EL CAMINO REAL STE 4 16.6 miles

2290 W EL CAMINO REAL STE 4
MOUNTAIN VIEW, CA 94040
Categories: MOUNTAIN VIEW CA

845 JACKSON ST 16.7 miles

845 JACKSON ST
SAN FRANCISCO, CA 94133
Categories: SAN FRANCISCO CA

1700 BROADWAY STE 310 17.1 miles

1700 BROADWAY STE 310
OAKLAND, CA 94612
Categories: OAKLAND CA

39180 FARWELL DR STE 231 18.1 miles

39180 FARWELL DR STE 231
FREMONT, CA 94538
Categories: FREMONT CA

350 HAWTHORNE AVE 18.1 miles

350 HAWTHORNE AVE
OAKLAND, CA 94609
Categories: OAKLAND CA

3300 WEBSTER ST, STE 1110 18.2 miles

3300 WEBSTER ST, STE 1110
OAKLAND, CA 94609
Categories: OAKLAND CA

3701 BROADWAY FL 5 18.4 miles

3701 BROADWAY FL 5
OAKLAND, CA 94611
Categories: OAKLAND CA

1517 GRAND AVE 18.6 miles

1517 GRAND AVE
PIEDMONT, CA 94611
Categories: PIEDMONT CA

4069 PIEDMONT AVE STE 910 18.6 miles

4069 PIEDMONT AVE STE 910
OAKLAND, CA 94611
Categories: OAKLAND CA

5763 STEVENSON BLVD 18.7 miles

5763 STEVENSON BLVD
NEWARK, CA 94560
Categories: NEWARK CA

2147 MOWRY AVE STE C1 18.8 miles

2147 MOWRY AVE STE C1
FREMONT, CA 94538
Categories: FREMONT CA

2000 MOWRY AVE 18.9 miles

2000 MOWRY AVE
FREMONT, CA 94538
Categories: FREMONT CA

3161 WALNUT AVE 19.0 miles

3161 WALNUT AVE
FREMONT, CA 94538
Categories: FREMONT CA

2500 GRANT RD 19.1 miles

2500 GRANT RD
MOUNTAIN VIEW, CA 94040
Categories: MOUNTAIN VIEW CA

573 W EL CAMINO REAL 19.1 miles

573 W EL CAMINO REAL
MOUNTAIN VIEW, CA 94040
Categories: MOUNTAIN VIEW CA

42650 CHRISTY ST 19.2 miles

42650 CHRISTY ST
FREMONT, CA 94538
Categories: FREMONT CA

6001 SHELLMOUND ST STE 850 19.2 miles

6001 SHELLMOUND ST STE 850
EMERYVILLE, CA 94608
Categories: EMERYVILLE CA

556 Mowry Avenue, Suite 103 19.3 miles

556 Mowry Avenue, Suite 103
Fremont, CA 94536
Categories: Fremont CA

2850 7TH ST STE 100 20.2 miles

2850 7TH ST STE 100
BERKELEY, CA 94710
Categories: BERKELEY CA

901 W EL CAMINO REAL 20.3 miles

901 W EL CAMINO REAL
SUNNYVALE, CA 94087
Categories: SUNNYVALE CA

2450 ASHBY AVE 20.6 miles

2450 ASHBY AVE
BERKELEY, CA 94705
Categories: BERKELEY CA

39400 Padeo Padre Pkwy Mission Bldg 20.6 miles

39400 Padeo Padre Pkwy Mission Bldg
Fremont, CA 94538
Categories: Fremont CA

3225 SELDON CT 21.0 miles

3225 SELDON CT
FREMONT, CA 94539
Categories: FREMONT CA

877 W Fremont Avenue, Ste H-2 21.0 miles

877 W Fremont Avenue, Ste H-2
Sunnyvale, CA 94087
Categories: Sunnyvale CA

2505 BATAAN ST STE O 21.6 miles

2505 BATAAN ST STE O
OAKLAND, CA 94607
Categories: OAKLAND CA

1195 E ARQUES AVE BLDG 1 22.0 miles

1195 E ARQUES AVE BLDG 1
SUNNYVALE, CA 94085
Categories: SUNNYVALE CA

46305 WARM SPRINGS BLVD 22.2 miles

46305 WARM SPRINGS BLVD
FREMONT, CA 94539
Categories: FREMONT CA

10050 N WOLFE RD Ste SW1-190 22.2 miles

10050 N WOLFE RD Ste SW1-190
CUPERTINO, CA 95014
Categories: CUPERTINO CA

46752 MISSION BLVD STE A 22.3 miles

46752 MISSION BLVD STE A
FREMONT, CA 94539
Categories: FREMONT CA

10050 BUBB RD STE 3 22.4 miles

10050 BUBB RD STE 3
CUPERTINO, CA 95014
Categories: CUPERTINO CA

46690 MOHAVE DR 22.4 miles

46690 MOHAVE DR
FREMONT, CA 94539
Categories: FREMONT CA

2737 WALSH AVE 23.2 miles

2737 WALSH AVE
SANTA CLARA, CA 95051
Categories: SANTA CLARA CA

5720 Stoneridge Mall Road, Suite 110 23.3 miles

5720 Stoneridge Mall Road, Suite 110
Pleasanton, CA 94588
Categories: Pleasanton CA

7601 STONERIDGE DR FL 1 23.6 miles

7601 STONERIDGE DR FL 1
PLEASANTON, CA 94588
Categories: PLEASANTON CA

7667 AMADOR VALLEY BLVD 23.7 miles

7667 AMADOR VALLEY BLVD
DUBLIN, CA 94568
Categories: DUBLIN CA

988 WALSH AVE 24.2 miles

988 WALSH AVE
SANTA CLARA, CA 95050
Categories: SANTA CLARA CA

315 S ABBOTT AVE 24.5 miles

315 S ABBOTT AVE
MILPITAS, CA 95035
Categories: MILPITAS CA

2301 CAMINO RAMON STE 108 24.6 miles

2301 CAMINO RAMON STE 108
SAN RAMON, CA 94583
Categories: SAN RAMON CA

1825 CIVIC CENTER DR STE 7 24.8 miles

1825 CIVIC CENTER DR STE 7
SANTA CLARA, CA 95050
Categories: SANTA CLARA CA

4847 HOPYARD RD STE 4-424 24.8 miles

4847 HOPYARD RD STE 4-424
PLEASANTON, CA 94588
Categories: PLEASANTON CA

6001 NORRIS CANYON RD Ste 142 24.8 miles

6001 NORRIS CANYON RD Ste 142
SAN RAMON, CA 94583
Categories: SAN RAMON CA

5601 NORRIS CANYON RD STE 140 24.8 miles

5601 NORRIS CANYON RD STE 140
SAN RAMON, CA 94583
Categories: SAN RAMON CA

For additional testing center locations in the State of California, please call (800) 221-4291

With our talented team of drug testing technicians, you can always count on receiving a professional and knowledgeable experience delivered each time with the utmost respect for confidentiality.

Every day we work closely with companies of all sizes and all industries, as well as with third party administrators and individuals in need of an San Mateo drug test. Our comprehensive portfolio of San Mateo drug testing and San Mateo alcohol screening services is designed to always meet your testing needs.

Our service of San Mateo drug testing, alcohol testing and DNA testing is designed to be your "One Stop Shopping" for all of your San Mateo drug testing needs.

San Mateo Drug Testing Services

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The ADT San Mateo drug testing centers provides a wide variety of standard drug and alcohol tests, as well as customized drug screening to meet a specific need. Our standard drug test is a 5 panel, 9 panel, 10 panel, 11 panel and 12 panel screen which can also be expanded to look for additional opiates, prescription drugs, K2, spice and bath salts. If you are not sure of what particular San Mateo drug test you need, please speak with one of our trained professionals to review some of the many options available to you at our San Mateo Accredited Drug Testing centers. Our California drug testing centers are located throughout the state and our ADT staff members are committed to providing affordable, convenient and confidential drug, alcohol and DNA testing services.

Local San Mateo Information

Local Area Info: San Mateo, California

San Mateo (/?sæn m??te?.o?/ SAN m?-TAY-oh; Spanish for "Saint Matthew") is a city in San Mateo County, California, approximately 20 miles (32 km) south of San Francisco, and 31 miles (50 km) northwest of San Jose. San Mateo had an estimated 2017 population of 104,748.

Documented by Spanish colonists as part of the Rancho de las Pulgas (literally "Ranch of the Fleas") and the Rancho San Mateo, the earliest history is held in the archives of Mission Dolores. In 1789 the Spanish missionaries had named a Native American village along Laurel Creek as Los Laureles or the Laurels (Mission Dolores, 1789). At the time of Mexican Independence, there were 30 native Californians at San Mateo, most likely from the Salson tribelet.

Captain Fredrick W. Beechey in 1827 traveling with the hills on their right, known in that part as the Sierra del Sur, began to approach the road, which passing over a small eminence, opened out upon "a wide country of meadow land, with clusters of fine oak free from underwood… It strongly resembled a nobleman's park: herds of cattle and horses were grazing upon the rich pasture, and numerous fallow?deer, startled at the approach of strangers, bounded off to seek protection among the hills… This spot is named San Matheo, and belongs to the mission of San Francisco." An 1835 sketch map of the Rancho refers to the creek as Arroyo de Los Laureles. In the 21st century, most of the laurels are gone, having been removed for development.[citation needed]

View all California locations.

San Mateo Employee Drug Testing

Businesses that utilize an employee drug testing program are commonly referred to as a Drug Free Workplace. However, many times companies do not fully qualify as a Drug Free Workplace because the drug testing program which they use does not have all of the components which make up a true Drug Free Workplace.

The benefits of being a true Drug Free Workplace can include but are not limited to:

  • Enhanced Employee Performance
  • Reduced Job Related Accidents
  • Reduced Employee Absenteeism
    • Lower Workers Compensation Rates
    • Improved Employee Moral
    • Customer Satisfaction

In addition, many companies regardless of size report that being a Drug Free Workplace has increased the quality of job applicants and improved the overall workplace environment.

Also many states such as California, Georgia, Kentucky, Mississippi, Tennessee, South Carolina, Virginia, Wyoming, Ohio, Alabama, Arkansas, Washington provide by law a discount on workers compensation insurance rates provided a business qualifies as a Drug Free Workplace in accordance with state law.
Locations Testing

States Which Provide Workers Compensation Discounts for Drug Free Workplace Programs

Alabama 5% Arkansas 5% California 5%
Kentucky 5% Misissippi 5% Ohio 5%
Tennessee 5% Virginia 5% Washington 5%

In addition to the States listed above, New York, Idaho, Hawaii and many other States also offer Workers Compensation Insurance discounts for employers who qualify as a drug free workplace. Discounts are based on individual program requirements and have no fixed rate.

Accredited Drug Testing Inc will work with your insurance agent to insure that any available discounts are provided for implementing and properly maintaining a drug free workplace.

Any company can benefit by being a Drug Free Workplace regardless of the number of employees but it is crucially important that any business that wishes to be a Drug Free Workplace maintain the program properly.

A properly maintained Drug Free Workplace should include the following:

  • A written Drug Free Workplace Policy
  • Employee Drug Testing
  • Employee Education
    • Supervisor Training
    • Employee Assistance Program(EAP)
    • Drug Free Workplace Signage

Studies have shown that substance abuse among employees has serious repercussions for both the working environment and the economic success of the business. As a result of drug and alcohol abuse, employers see increased costs related to medical fees, absenteeism and overall productivity.

San Mateo companies regardless of size wishing to implement a Drug Free Workplace can contact Accredited Drug Testing and ADT can schedule all drug tests and manage the entire California Drug Free Workplace program for our clients. Simply speak with an ADT drug testing representative and tell them you are interested in our San Mateo drug testing services and programs.

When it comes to employee drug testing, we recognize the importance of convenience and confidentiality. For that reason, we offer online scheduling and delivery of test results, which allow employers to utilize our services from the convenience of their office.

In addition, we also provide Mobile Drug Testing that brings our San Mateo drug testing services right to your place of business. These on-site services are able to ensure maximum employee participation as well as minimum disruption to the work day. (Additional fees may apply).

San Mateo Alcohol Testing

In addition to offering San Mateo drug testing in , ADT also offers urine, saliva, breath and ETG alcohol testing for DOT and NON-DOT requirements.

San Mateo DOT Drug & Alcohol Testing

As a National drug and alcohol testing company, the staff of Accredited Drug Testing Inc is certified and qualified in DOT drug and alcohol testing collections and our in-house staff are fully knowledgeable of DOT 49 CFR Part 40. All DOT tests include test collections by a qualified ADT technician, SAMHSA certified laboratory analysis and verification by a qualified Medical Review Officer. Accredited Drug Testing provides DOT required 5 panel urine tests, breath alcohol tests, consortium/random pool membership and all Federal Chain of Custody documents. If you need a DOT drug or alcohol test, simply call the ADT office and speak with one of our DOT drug testing specialists.

DOT Drug Testing in San Mateo

To review DOT 49 CFR Part 40 Drug and Alcohol Regulations - Click Here.

ADT can schedule and manage all of your DOT and NON-DOT drug testing needs Nationwide, anywhere and at anytime.

Additional Services-Background Checks and Physicals

In addition, to San Mateo drug testing, San Mateo alcohol testing and San Mateo DNA testing, Accredited Drug Testing Inc also provides background checks for employers conducting employee screenings.

Accredited Drug Testing also provides Department of Transportation (DOT) physicals for CDL truck drivers(49 CFR, Part 40) or companies in need of Return To Duty or Job Fitness exams.

"One Stop Shopping" for all of your San Mateo, CA Drug Testing Needs

If you are a HR/Office manager needing employee drug testing, a school, government agency or simply an individual in need of a drug or alcohol test, Accredited Drug Testing Inc provides drug testing for pre-employment, random, reasonable suspicion, return to duty, post accident, court ordered or any other drug testing need, Call Accredited Drug Testing today (800)221-4291

Show Regional Data

Population (total): Population in 2017: 104,748 (100% urban, 0% rural). >Population change since 2000: +13.3%

Population (female): 52,915

Median Age: 38.7 years

Median Rent: Median gross rent in 2017: $2,480.

Cost of Living: March 2019 cost of living index in San Mateo: 175.0 (very high, U.S. average is 100)

Poverty (overall): Percentage of residents living in poverty in 2017: 9.5%

Poverty (breakdown): (5.1% for White Non-Hispanic residents, 9.2% for Black residents, 15.9% for Hispanic or Latino residents, 7.3% for American Indian residents, 9.8% for Native Hawaiian and other Pacific Islander residents, 19.4% for other race residents, 5.0% for two or more races residents)

In 1810 Coyote Point was an early recorded feature of San Mateo. Beginning in the 1850s, some wealthy San Franciscans began building summer or permanent homes in the milder mid-peninsula. While most of this early settlement occurred in adjacent Hillsborough and Burlingame, a number of historically important mansions and buildings were constructed in San Mateo.[citation needed]