Rapid urbanization, technological advancement, and sustainability challenges are reshaping the future of cities. Traditional urban development models, which often separate architecture, infrastructure, transportation, and operational systems, are increasingly inadequate for addressing the complexity of contemporary metropolitan environments. Emerging technologies including artificial intelligence, autonomous systems, digital twins, intelligent infrastructure networks, and real-time urban analytics are enabling a new generation of engineered urban environments capable of adapting continuously to changing conditions. This article examines the engineering transformation of urban form through the integration of smart infrastructure, autonomous operational systems, and architectural innovation. Particular attention is given to systems engineering principles, digital urban ecosystems, infrastructure intelligence, adaptive architecture, resilience engineering, and future urban operating models. The study argues that future cities will function less as collections of independent buildings and more as interconnected cyber-physical systems whose performance is continuously optimized through data-driven engineering frameworks.