The production, perception, and representation of urban space and urban property relations have been urgent "technological" questions since before the birth of urban geography as a discipline. The growth and differentiation of cities worldwide has been shaped by a long-evolving technical frontier, one often turned toward the accumulation imperatives and exclusions of private real estate development. Today, real estate in global cities is experiencing a fresh technological boom, featuring novel techniques for real estate mapping, valuation, financialization, and other key functions. This special issue explores and theorizes these technological developments in real estate, past and present. Collected papers articulate urban geographical scholarship with insights from critical political economy and technology studies, including digital geographies. The collection argues that the relational politics of property manifest in crucial ways through the development and application of urban real estate technologies, and that geography and urban planning are well positioned to offer insights into such technological and political economic mediations, both historical and unfolding.