The subject of the City Upgrade project is architectural and urban position of middle-sized European cities in competitive confrontation with global mega-cities of the future. The task of this project is to develop a conceptual framework of a universal sustainable city upgrade, which could be applied everywhere, regardless of location. Design and development of innovative architectonical solution proposals for novel forms of life-and-work in so-called "mixed reality environments" in the 21st century. Definition and example of a "strategic image" for the city of the future. The excerpt of the contributions from all Space Engineering pages can be found here. This is the collection of puzzle information inputs, as a building bricks of the future environments.