Kastle Systems International

Kastle Systems International

Kastle Systems International operates from Falls Church, Virginia, with additional offices in Chicago and New York, serving over 10,000 facilities across the United States. The firm has specialized in managed physical security for nearly half a century, providing a continuous "security as a service" model that bundles system design, installation, monitoring, and maintenance under long-term client relationships. Kastle’s platform combines cloud-based access control, AI-enabled video surveillance, and visitor management into a single managed service. The firm serves commercial office buildings, multifamily residential communities, and specialized outdoor operations including construction sites and auto auctions. Its access control system supports digital credentials through Google Wallet and Apple Wallet, while the video analytics layer performs appearance-based and area-based searches. The monitoring backbone is a 24/7 security operations center delivering live remote video guarding and continuous expert oversight — a structure that embeds Kastle as the operator of record rather than a one-time installer. Kastle produces a proprietary Office Occupancy Barometer tracking card-swipe data from its national client base, a dataset widely cited by media outlets and commercial real estate analysts as a proxy for return-to-office trends. The dedication to managed services means Kastle retains the operational and upgrade risk — a posture that differentiates it from traditional security integrators who hand off systems after deployment. By engineering, monitoring, and maintaining every layer of the security stack under one roof, Kastle aligns its economic interest with system uptime rather than equipment sales cycles. This architecture turns physical security into an operating expense with a single accountable provider — an unusual model in a fragmented industry still dominated by project-based hardware deployments.