Standing 181 metres high with 36 floors, the Caleido Tower, located next to the Cuatro Torres Business Area complex, is the seventh tallest building in Spain. Highlights of this building include not only its original inverted T-shape structure but also its outdoor space, composed of large green areas spread over 33,000 m2, known as Parque Caleido. The shopping and restaurant area, opened on 29 September 2022, offers a wide variety of fashion boutiques and restaurants serving cuisine from all over the world, spread over an area of 16,000 m2.
The construction of this tower is based on what is known as blue architecture, an architectural approach that combines the well-being of people with respect for the environment. The project, designed by the architectural studios Fenwick Iribarren and Serrano-Suñer Arquitectura, is inspired by the monolith of the film 2001: Space Odyssey by Stanley Kubrick as well as the Seagram Buildings in New York and the John Hancock Center in Chicago. It is a quadrangular prism covered with two panels of black glass that create between them an air chamber allowing for more efficient air conditioning, earning this building a gold class LEED environmental certification.
The west view of the building looks like an inverted T. Sitting atop the plinth are the garden areas, which will also provide a campus for the Institute of Business (IE), as well as public access to the different areas of the building, in which Grupo Quiron Salud will have a centre dedicated to sports medicine, Olympia.
Espacio Caleido: shopping, leisure, hot art and gastro area
Inside the building and in the surrounding area, there are also six cinemas with exclusive seats, showing films in their original language, Ocine Urban, several retail outlets with all the latest trends by leading fashion brands, accessories, sports, and technology in their outdoor spaces, and parking with 2000 spaces for green vehicles.
Caleido is an innovative new culinary area, run by leading firms in the food and beverage sector, with international restaurants, spaces for lovers of healthy food, and culinary novelties for those seeking new experiences and flavours.
Art is also present in the public spaces of this new business complex through 11 installations, murals, and permanent sculptures made by a new generation of artists, in which the unifying thread is colour, chosen on the basis of sustainability and movement. 
Some of the commissioned artists created their art in situ, including Maya Hayuk (New York, pioneer of urban art and abstraction), Boamigura and SpY (Madrid),Topic Tomislav (Berlin, from the Quitussenz duo), Thiago Mazza (Brazil), and Lukas Ulmi (Switzerland). It is therefore the largest public art project developed in Madrid in recent decades.
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