Modern skyscraper, urban cityscape, business district, daytime, clear sky, reflective glass façade, steel frame structure, sleek lines, minimalist architecture, corporate atmosphere, high-rise building, grand lobby, marble flooring, metal detectors, security checkpoints, surveillance cameras, uniformed guards, ID card access control systems, biometric authentication, secure doors, panic rooms, emergency response plans, fire suppression systems, evacuation routes, stairwells, alarm systems, motion sensors, CCTV monitors, command center, situation room.