Exclusive office building, a masterpiece by Sáenz de Oiza and of 20th century Spanish architecture, located in the most emblematic point of Azca. Its more than 100 meters high are spread over 28 floors with a typical area of 1,338 m2. After an ambitious rehabilitation, Castellana 81 is positioned at the forefront of sustainability, accessibility and technology. In this sense, the building has the LEED Platinum certification in the Core & Shell category, which makes it the first and only office building in the financial center of Madrid to hold this certification. As part of Castellana 81's commitment to accessibility and to a diverse society, the building has achieved the highest AIS (Accessibility Indicator System) rating of 5 stars. It also has the Cerebroprotected Space and WELL Health-Safety Rating certifications. Castellana 81 is the first WELL office building in Spain and the fifth in Europe to obtain the WELL Building Standard Gold certification in the Core & Shell category. WELL is the first global certification for buildings that focuses solely on human health and well-being and is based on seven years of scientific, medical and architectural research. Castellana 81 has a complete floor dedicated to services with an auditorium with capacity for 188 people equipped with the latest technology and an adjoining area for holding events, a meeting center with seven rooms, physiotherapy service, gym, showers and changing rooms. Integrated Management System: ISO 9001, ISO 14001 and OHSAS 18001. In addition, the building has: - Facility Manager. - Access control. - 24-hour maintenance service. - Spaces for electric vehicles and bicycles. - Internal messaging. - MEETING PLACE with Auditorium and 7 meeting rooms. - Coffee shop. - Physiotherapy service. - Shower and changing room space.