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Complete security services for buildings and tenants.

We work smart so you can rest easy.
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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 consulting
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  • Video monitoring
  • Situational awareness
  • Guard optimization
  • Crisis management & investigations
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Service Excellence

Our multi-layered Center of Service Excellence is the backbone of our company that enables us to deliver first class security services and develop long lasting business partnerships.

Quality Control

GMSC's Quality Control allows us to regularly develop, test and maintain our programs and certifications to ensure the consistent delivery of quality services.

GMSC University

GMSC's training and development, with over 100 courses, ensures our staff are engaged and well trained. As a result they stay longer, are better utilized and deliver the best service.

Client Services

A robust infrastructure, a strong onsite presence and frequent communications are key elements that allow us to maintain first class service standards. Our staffing structure is multi-layered, with a single dedicated point of contact overseeing your account.


GMSC is committed to sustainability throughout our operations. Providing safe work environments for our clients contributes to their well-being and allows them to operate more efficiently.

Specialty Services

We offer a robust suite of customized specialty services to buildings and tenants. Our staff is certified and well trained.

Our Commitment to Success

Successful security programs rely on these key factors.

Thorough Training: Our staff is trained above and beyond standard industry requirements.
Detailed Quality Control: We regularly track and measure data to ensure quality.
Comprehensive Coverage: We never cut corners. You can rest assured your space is covered.

What they’re saying

“In 2016 we briefly switched to a lower cost guard service, and in less than a year we had switched back to GMSC. Ours is a 2 million square foot Class A property with high service level expectations. GMSC staff, from the onsite guards to senior management, is professional and reliable. They have a strong onsite presence and a responsive and well-trained guard staff. We have been impressed with their flexibility and willingness to customize their protocol to meet the high standards of our tenant base.”

Andrew Toland, General Manager, Cushman & Wakefield, 1211 Avenue of the Americas
"In addition to giving excellent service at our Park Avenue South properties, GMSC has been especially efficient and effective in the way they distribute their staff. By more smartly allocating our guards they were not only able to increase security, but also save us money."
Avi Itzikowitz, Director of Operations, Atco Properties

Where We Operate

  • New York

    Eleven Penn Plaza
    New York, NY 10001
  • Chicago

    222 Merchandise Mart Plaza
    Chicago, IL 60654

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