The Property Issue – Politics of Space and Data This publication deals with a fundamental contradiction in contemporary society: the contradiction between the social character of production and the private appropriation of the results of this production. Specifically, it deals with the question of ownership of land and data, and the effects of these ownership relations on the production of space. Who owns the land? This question is of crucial importance for all societies and their coexistence. This is because the availability of land and property controls the production of space and the social order. The fact that land (space) is as vital to life as air and water means that its use should not succumb to the unmistakable play of free (market) forces and individual whims. Who owns data? For urban planning, the issue of data ownership has become just as relevant as land ownership. In this issue we therefore discuss the politics of space and the politics of data, the real and virtual capital of the city of the future. The debate is guided by two main questions: How do we deal with space and data as planning resources? And what role do architects and urban planners play in the digital society? The newly commissioned essay "The City as Enemy" by Hannes Grassegger is a must read for everyone who wants to understand the struggle of the citizens of Hong Kong against the smart city and surveillance technology. Featuring interviews with Christian von Borries, James Bridle, Egbert Dransfeld, Renée Gailhoustet, Ludger Hovestadt, Raquel Rolnik, Patrik Schumacher, Deane Simpson, Douglas Spencer, Hans-Jochen Vogel And contributions by Benjamin H. Bratton, Michaela Friedberg, Hannes Grassegger, Florian Hertweck, Markus Hesse, Niklas Maak, Shannon Mattern, Oksana Mironova, Christopher Roth, Wolfgang Scheppe, Trebor Scholz, Nick Srnicek, Manuel Shvartzberg Carrió, Robert Thum, Milica Topalovic, Harald Trapp, Bianca Wylie, and many more