For the company IBM Fisac build one of his buildings with greater urban vocation. The protection from the heat of the afternoon sun - a priority for the company after the experience with one of their American headquarters designed by Saarinen - encouraged him to try out several types of horizontal brise-soleil, but he finally opted for a superposed vertical concrete element to avoid direct radiation from the sun in the interior of the building. In this way, on a glazed plinth that showed strollers the first computers at work, six floors of open-plan offices and an attic for the cafeteria and annex services are concealed behind a permeable folding screen that echoes the vertical rhythm of the 19th century facades of Madrid's center.