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An extraordinary 19ha 鈥渃ity of communications鈥�, with a symmetrical layout borrowed from an ancient Roman military camp, has just been completed on the northern outskirts of Madrid. Known as Las Tablas, it has been developed by Spain鈥檚 largest telecoms company, Telef贸nica, with Bovis Lend Lease as project manager.

The 400,000m虏 complex operates as a complete city for 12,000 staff, offering everything but living accommodation. It brings together 12 office blocks, a corporate building with an auditorium and visitor centre, a shopping centre, gymnasium, healthcare centre and cr猫che.

Designed by Rafael de La-Hoz of Madrid, the 14 buildings have been arranged in a severe rectilinear layout around wide landscaped planters, a large rectangular piazza with paved walkways and patios and a central pond with fountain.

The four corners of the complex are staked out by cubic office blocks, conceived by de La-Hoz as lookout posts of a defensive settlement. They sport a staggered arrangement of projecting glass fins that create shifting crystalline patterns of shadow in the sunlight. They also resemble ice cubes, since they have sharp corners and are entirely faced in a glass skin fritted in white dots that cuts out solar gain and appears opaque from outside, although it is transparent from the inside.

Set in from the four corner cubes is an open rectangle of 10 lower buildings bound together by a continuous flat roof. As well as providing shade to the passageways between the buildings, the continuous flat roof supports 26,000m2 of photovoltaic cells, which generate 4.4 million kWh of electricity, or 18%, of the complex鈥檚 needs.

In effect, Las Tablas is a defensive encampment for the digital age. But instead of defending itself against barbarian invasions, it deploys its solar-resistant facades and photovoltaic panels to keep global warming at bay.