Safeguarding Your Commercial Property with Trustworthy Security

Exceptional Onsite Security Services for Commercial Establishments 

At Guardian Security Agency, we understand the unique security needs of commercial properties. We deliver top-notch onsite security services that ensure the safety of your assets, personnel, and operations.

Our Comprehensive Commercial Security Solutions

Tailored Security Measures for Your Property
Our commercial security services are designed to address diverse security requirements. We offer:

24/7 Onsite Security Patrol: Our trained security personnel provide constant surveillance to prevent any security breaches or threats.

Advanced Surveillance Systems: We deploy state-of-the-art technology to monitor your property effectively.

Emergency Response Services: We are always prepared to respond to any security emergencies.

Risk Assessment and Security Consultation: We offer personalized security strategies based on detailed risk assessments of your property.
Security guard in uniform using a two-way radio while monitoring an outdoor property.

Unarmed On-Site Security for Businesses and Schools

Our unarmed on-site security guards deliver a sustained, visible human presence that no remote solution can replicate. Brentwood and the wider Contra Costa County area span retail corridors, commercial and office buildings, light manufacturing near Harvest Commerce Center, industrial and warehouse properties, residential communities, and school campuses, creating diverse security demands that a professional unarmed on-site guard is uniquely equipped to address.

Guard Qualifications That Meet California Standards

Every guard we deploy holds a valid BSIS Guard Card, as required under California law. Our guards complete background screening, Powers to Arrest training, and state-mandated coursework before setting foot on any client property. A dedicated Training and Quality Assurance Coordinator keeps all officers current with licenses, tactics, and post procedures. Our management team draws on more than 50 years of combined law enforcement and personnel management experience.

How Do Unarmed On-Site Guards Protect Properties 24/7?

A professional on-site security guard protects your property through sustained physical presence, incident documentation, access control, and immediate response. Unlike automated systems, our guards exercise real-time judgment to intervene, de-escalate, and report before situations worsen. Guards are stationed and scheduled to match your property's operational rhythms.

Unarmed On-Site Guard Services

We provide unarmed guard services exclusively. Our unarmed on-site guards are well suited for:


  • Retail centers and office buildings where a visible, approachable presence is the primary goal.
  • Environments where de-escalation, access management, and customer-facing professionalism are the core needs.
  • Residential communities, apartment complexes, and HOA properties needing consistent patrol and resident-facing service.
  • Schools and campuses where a calm, professional presence supports staff, students, and visitors.


Every guard we assign holds a valid BSIS Guard Card. Because we operate as an unarmed agency, we focus on visible deterrence, access control, and de-escalation, and we assess your property before recommending a coverage plan.

Industries and Properties We Serve Across Contra Costa

Our unarmed on-site security teams are experienced across the sectors and property types active throughout Brentwood and all of Contra Costa County, including retail and strip mall properties, commercial buildings and office complexes, residential communities such as apartment complexes, condominiums, and HOA neighborhoods, schools and educational campuses, light manufacturing and industrial flex facilities, warehouse and distribution operations, agribusiness operations, and active construction sites. We serve properties countywide, from Brentwood, Oakley, Antioch, and Pittsburg to Concord, Walnut Creek, Martinez, Richmond, and the surrounding communities.


For a full view of where we work, visit our service areas page. Call us at (925) 356-3034 to submit your information. We will discuss your property and coverage needs, then build a plan with unarmed on-site security guards tailored to your Brentwood or Contra Costa County location.

Office Building Security Service FAQs

  • How Do I Know if My Office Building Needs On-Site Unarmed Security Guards?

    If your building hosts multiple tenants, experiences high visitor volume, or sits within a high-traffic corridor like Sand Creek Road or Balfour Road, on-site security is a practical investment. We conduct thorough risk assessments to identify access vulnerabilities and the level of unarmed office building security service presence best suited to your property. We also offer remote guard surveillance with patrol officer response, monitoring your existing camera system or equipment we provide, so incidents are met with a dispatched patrol officer or, if necessary, the police.

  • What Is the Difference Between Access Control and an Unarmed Security Guard?

    Key cards and intercoms restrict entry but cannot respond to situations, exercise judgment, or assist a tenant in distress. Our unarmed officers complement technology-based systems with human oversight and real-time decision-making, providing the most effective coverage for multi-tenant office environments in Brentwood and the surrounding East Contra Costa area. For hours when on-site staffing is not needed, we offer remote guard surveillance with patrol officer response, monitoring live camera feeds and dispatching a patrol officer, or the police if the situation calls for it.

  • Can I Get Unarmed Security Guards on a Temporary or Short-Term Basis?

    Yes. We offer flexible arrangements including short-term assignments, event-specific coverage, remote guard surveillance with patrol officer response, and trial periods for office building security. Whether you need coverage for a corporate event or ongoing weekday lobby staffing, we can structure a plan around your needs. Visit our contact page to discuss scheduling options.

  • How Do Your Unarmed Guards Handle Incidents Inside an Office Building?

    The officers that are part of our office building security services follow documented post orders specific to each property and produce accurate Daily Activity Reports and Incident Reports every shift. When an incident occurs, officers respond per established protocols, notify appropriate parties, and document the event in detail. Our management team reviews all reports before forwarding them to clients, keeping property managers fully informed. On properties covered by remote guard surveillance, our monitoring team watches live video from your existing cameras or from equipment we install, then responds to activity by dispatching a patrol officer to the site and contacting police when the situation requires it.

  • What Areas Near Brentwood Do You Also Serve?

    We provide commercial property security services to clients in Concord, Oakley, Antioch, Walnut Creek, Pleasant Hill, and the broader East Contra Costa County region. If your portfolio spans multiple East Bay locations, we can coordinate coverage across sites under a single plan. Call us at (925) 356-3034 to request an honest quote today.

Unarmed security guard using a two-way radio while patrolling inside a commercial building.

Get in Touch with Us

Superior Security Services for Your Commercial Property
Contact us at put email here or call us at 877-276-9598 to discuss a security plan tailored to your commercial property's needs. Guardian Security Agency - your partner in securing your commercial property.