Product Spec Sheet

ElementBrandProduct link
ManufacturersiGuzziniUnderscore InOut Top Bend 16mm
ManufacturersGuardian Glass
General ContractorAcciona S.A.

Product Spec Sheet
Architectural glass
General Contractor

Castellana 77

Luis Vidal + Architects (LVA) as Architects

All cities have silent icons and Castellana 77 is one of them. A building that rises in the AZCA district, the financial heart of Madrid (Spain) which beats with the rhythm of the country´s capital and driving force for business, is a symbol of urban and economic regeneration. Castellana 77, which belongs to GMP group, is an investment opportunity and a new icon of the architectural heritage of Madrid.

The identity of this emblematic building is emphasized with its surprising “new skin”, set to become a design reference. The design reflects the DNA present in all luis vidal + architects projects at all scales: economic, social and environmental responsibility. Guided by these three principles, our firm transforms each design into a legacy.

In the words of Luis Vidal, the founder: “It is a great responsibility to propose a novel design for the building that forms part of Madrid´s identity. “

Our goal for Castellana 77 was to increase its value by creating a new, recognizable, flexible and sustainable property that generates a high-quality space and whose new image will become part of Madrid’s skyline – a city that respects its roots while looking to the future.

luis vidal + architects have transformed Castellana 77 into a flagship of GMP Group, which will stand at the forefront with this sustainable and aesthetically bold building that catches the eye and leaves a mark.

The architect´s proposal for the façade, with its distinctive and unique elements that penetrate the building´s surface, is not only visually striking but also energy efficient and sustainable, as it incorporates slats that serve as protection from direct sunlight. For this reason, each slat has a different orientation and consequently, each façade a unique appearance.

The envelope, envisaged as low emission glass skin with solar control, is the result of thorough research into sunlight and shade on the west, east and south façades at critical hours every day of the year.

Apart from substantial energy savings, this energy efficient envelope provides greater level of comfort and optimal well-being for users. The intervention of luis vidal + architects has modernized the building´s services, transformed its 17 floors and proposed a more flexible ground floor and lower ground layouts, in order to accommodate offices and retail space.

Four floors have been restored for garage space, together with an additional floor, designated for the building´s services.

Designed with environmental responsibility in mind, the building has been awarded the prestigious LEED GOLD certification and Best Office Architecture from Spain at the European Property Awards 2017.

Only a strong identity can turn the invisible into visible. Located in the heart of Azca (Madrid, Spain), but hidden behind a row of prominent buildings and withheld from the eyes of the citizens for more than four decades, Castellana 77, has slowly fallen prey to the passage of time. Changes of tenants and owners and the development of the surrounding area over time, have taken its toll on the identity of Castellana 77, known as the Ederra tower or as Saint Gobain building in the late 20th century. Excluded from the urban dialogue and with its façade decayed, the building´s transcendence was lost.

Four decades later, the property was purchased by the GMP Group and after it was fully remodelled by luis vidal + architects, once decaying building has become the real estate gem of Azca. The 21st century Icarus designed to defeat the Sun.

The firm has based its proposal for Castellana 77 in two key conceptual elements - light and identity.

The main goal was to tame sunlight and take advantage of it, in order to create an image of strong identity both day and night.

After that, the challenge was also to make the hidden building visible, place it in the front row and give it the necessary prominence to stand against its “big brothers” (Castellana 81, Picasso Tower, etc, all in Madrid). Therefore, the slats emerged as pragmatic elements, each having a specific curvature and backlight.

After a rigorous study of the building site and thermal and light conditions, luis vidal + architects developed a parametric system as a response to the dual nature of the sunlight, which is not only the source of energy but also of (un)controllable heat.

ETFE – an innovative material that lets sunlight in, reduces the heat build-up and makes the application of backlighting possible – enabled our team of architects to develop a pioneering façade solution, formed by thousands of slats whose position responds to the analysis of the sunlight and shading, which will become an urban icon of Madrid.

This innovative architectural solution is applied differently on each facade. The combination of different curvatures provides protection from the intense daylight, saves energy and maximizes the user comfort. We tamed the light without being overpowered by it.

The skin of Castellana 77, illuminated by kilometres of led lights at night, emphasizes the corporate identity of the building´s users and makes the building visible and prominent within its surroundings.

The visual power of Castellana 77 slats leaves a genuine and memorable digital footprint, providing the building with a new and long-needed identity. Design and aesthetic criteria are brought together to create an image that stands out in Madrid’s skyline. Shape and light during the day and the night.

The building gains prominence in the urban scene due to its constantly changing appearance caused by light mutation, both day and night.

During the day, the movement of the Sun along with the changeable translucent shading elements that vary with the light intensity, generates shadow play on the façade. At nightfall, the identity emerges from different light configurations on the inside of the slats.

Castellana 77

Guardian Glass as Manufacturers

Castellana 77, a sustainable building with a Guardian Glass glazed facade

In the heart of Madrid’s financial centre, in the AZCA district, stands Castellana 77, a building which, after two decades out of service, has begun a new iconic life thanks to luis vidal + arquitectos. The original 1977 tower is now a 62-metre-high office building, defining the skyline of the city in its own special way. With completion of the restoration, the building is a leader in terms of energy efficiency and environmental profile and has received the prestigious LEED Platinum certification. Guardian Glass high performance glass products for the façade helped contribute to achieving this LEED certification.

Clever use of natural light and the desire to create a strong identity for the building to stand out in its environment were two of the essential pillars for the architectural project. According to Luis Vidal: “The goal was to update the building, resulting in a new property that is both flexible and sustainable, while creating high quality commercial space with a new image incorporated into the skyline of Madrid, a city which respects its roots, but is still forward-looking.”

This has been achieved with an integral restoration, primarily focused on building a new façade with a sharp vertical modulation that utilises Guardian SunGuard® SN 70/41 coated glass in a high selectivity glazed curtain wall.

This modern, inspiring construction system also incorporates an added feature that provides extra solar protection by using fins with a 60cm overhang to provide shade (separated from the main façade by a 15cm gap for maintenance and cleaning). These work in conjunction with Guardian glass to further improve the general performance of the building.

Over a total area of 21,000m², architecture and construction works also included the upgrade of all the facilities in Castellana 77, as well as the transformation of its 18 floors above ground (16,261m² in total), making the ground floor layout more flexible. The ground floor can hold both offices and commercial space. The original four storeys used for parking have been regenerated, as well as an additional floor for general building facilities. The five underground floors now hold over 200 parking spaces.

A living, efficient glass facade

Building the Castellana 77 façades comprised two stages. First, the dismantling of the original building, which was completely out of date and was suffering from a significant amount of wear and tear. Second, the installation of the new envelope. This resulted in the following types of facade based on area and orientation: a curtain wall façade, a curtain wall façade with slat protection, and a ventilated façade.

The curtain wall façade is made from an extruded aluminium profile system and infill panels made from laminated high selectivity neutral coated glass with SunGuard SN 70/41 as the external pane. The SuperNeutral™ (SN) family is one of the coated glass options in the Guardian SunGuard high performance architectural glass range. With 70% light transmission, this solution provides a neutral appearance with maximum solar control. The façade system enables free ventilation of glazing edges, which prevents unwanted condensation.

EFTE fins for improved energy efficiency

Another poignant feature of the architectural work at Castellana 77 are the EFTE (Ethylene Tetra-Fluoro-Ethylene) fins, which were specially designed for this project, with a specific orientation and curvature to allow them to flow through the skin of the building, giving it a unique, distinctive shape. Regardless of their aesthetic purpose, the primary function of these fins is the continual pursuit of improved energy efficiency and sustainability, as they protect the structure from direct exposure to the sun. This advanced material, EFTE, allows light to pass through, but not heat, making backlighting a possibility. This allowed the architects to create a continuously evolving façade.

During the day, the movement of the sun and shading (which depends on light intensity) generate a brightly changing image on the façade. At night, its identity emerges from inside the fins with different light configurations, achieved using several kilometres of installed LED lights.

Ultimately, the façade of Castellana 77, with SunGuard SN 70/41 glazed units and EFTE fins, enables low-emissivity and high solar control capacity. A rigorous study of the building’s exposition to the sun and shade on the west, east and south façades at different critical times every day of the year, led to an efficient design that enables significant energy savings, as well as improved comfort and well being for the building’s occupants.

LEED sustainability and certification

Castellana 77 is now a building with a high level of sustainability. For this reason, it received LEED certification(Leadership in Energy and Environmental Design) awarded by the US Green Building Council, a group of construction industry leaders promoting and fostering environmentally-sound structures.

LEED is one of the most prestigious worldwide certifications that evaluates the sustainable behaviour of buildings, seeking to promote environmentally-friendly, as well as financially viable, comfortable properties. The category of the certification for Castellana 77 was “Platinum” in the Core & Shell system.

This distinction was awarded to the building, among other factors, on account of its:

- Energy efficiency: the glazed façade and solar protection fins, as well as energy management and control performance, result in maximum thermal and lighting comfort for occupiers of the building. This helps to reduce energy consumption by up to 33% per year, compared to a conventional building with the same usage and surface area. The air conditioning and lighting systems are 46% and 34% lower respectively.

- Its natural lighting and access for views: 95% of workers and occupiers of Castellana 77 receive natural light and have direct views of the outside.

- The quality of the interior atmosphere: with an energy efficient air-conditioning system based on 100% exterior air intake.

- Its location and wide range of transport options to access the building.

- The efficient use of water by adding efficient bathroom facilities so that the building can achieve a 39% reduction in water consumption, compared to other similar buildings.

- Its sustainability awareness: since its restoration, the building uses primarily recycled materials of certified local origin.

- Its low or zero emissions: the use of 100% of the materials have no (or little) volatile organic emissions.

- Guardian Glass is a member of the US Green Building Council.

Castellana 77

iGuzzini as Manufacturers

Azca is Madrid’s business district, and for almost forty years, the tower that stands at number 77 Paseo de La Castellana has marked its centre. Built in the 1970s, the tower was originally known as the Ederra Tower or the Saint Gobain building. For years, then, it has stood contemplating the passing of time and being marked by time in a process that gradually aged its facade, depriving it of the kind of interaction with its urban context that every building should enjoy.

Now, its recent acquisition by the Gmp property group and the refurbishment carried out by the Luis Vidal + Arquitectos studio has made the tower a new Azca icon, thanks mainly to the management of its energy impact that is so efficient the complex has even been awarded prestigious LEED Gold certification.

Light and identity are the two main concepts on which the design is based, as the architectural studio is firmly convinced that only a powerful identity can make what is visible invisible. The first goal defined was that of taming sunlight and exploiting it to create an image that would express a clear identity during both the day and night. Light is a source of both energy and heat. The issue of heat has been resolved by adding a series of ETFE blade-like strips to the facade, which allow light to pass, but not heat. The strips were positioned after careful research into the exposure of different kinds of facade to sunlight. The result is a series of waves with specific curves and consequently specific areas of shade, in order to guarantee protection, energy savings and visual comfort.

Kilometres of RGB Underscore InOut light lines, using DALI protocol, have been installed along these ETFE strips to create changes in colour, tone and movement that light up the building and turn it into a landmark on the nocturnal skyline. So, it has become a building that literally changes through light.   

Share or Add Castellana 77 to your Collections
Reno hotel
next project

Reno hotel

Bangkok, Thailand - Build completed in 2020
View Project