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Around the Clock Protection. A Name You Know and Trust.

Highly Trained Staff. A Committment to Quality for Over 30 Years.

What We Do

For over 30 years GMSC has been securing high profile buildings and offices across New York and Chicago. We are a large volume company that provides a boutique service. We secure over 25 million square feet of commercial, retail and Fortune 100 companies, including IPG, Amazon, Facebook, Bloomberg, VNO, Manhattan Mall, Merchandise Mart, Rego Park Center and many more.

Our Services


  • Fire/life safety director
  • Concierge service
  • Uniformed guards
  • Loading dock security
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  • Video surveillance
  • Access control
  • Security tour systems
  • Security operations center
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  • Threat assessment
  • Emergency Preparedness
  • Crisis management
  • Investigations
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Who We Serve

Commercial Office

GMSC provides full service security to many of the most complex Class A and Trophy buildings in New York and Chicago.

Education & Institutional

Safety on school campuses is a number one concern in America. GMSC’s comprehensive threat analysis can help you assess weak points on campus.

Events & Conventions

GMSC provides physical security presence for events and conventions of all sizes.


From guards and concierge to access control, GMSC is expert in securing residential buildings.


Theft and vandalism can become a problem on a construction site. GMSC helps secure and protect your project.


Theft and robbery are an ongoing problem in retail. GMSC designs customized security programs to address the needs of its retail clients.


To take the burden off you by being your single source provider for all elements of security.


GMSC believes in hiring from diverse segments of the security industry, from law enforcement to military to systems integrators. Bringing together these varied backgrounds allows us to look at the security picture holistically rather than from a narrow framework.

Fully Integrated

From guard services to electronic security, monitoring and security consulting, we are truly an integrated security provider. You’ll never hear the blame game from GMSC because we all work for the same company. Let us handle all your security needs.

  • Q
    Question current policies and procedures, and improve them
  • U
    Urgency in response to all requests
  • A
    Appreciation for diversity
  • L
    Long lasting relationships with customers and employees
  • I
    Innovative to generate value and drive growth
  • T
    Training and talent retention
  • Y
    Yielding company success

Giving Back

At GMSC, we believe giving back to our community is not only a responsibility but a reward.
  • Corporate Philanthropy
  • Contributions of Time, Material and Expense
  • Employee Giving
    and Volunteerism

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