For over 30 years GMSC has been securing high profile buildings and offices across New York and Chicago. We are a large volum ... e company that provides a boutique service. Our services include: > Fire/life safety > Systems integration > 24/7 monitoring > Security consulting 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. read more