This is the ‘Mutante Building’, the second most expensive in Madrid

The Castellana 77 is reborn, with a more modern aesthetic, with a new concept and, more importantly, with more market value.


If designing and constructing a building from scratch (what is called new construction) is a complex and important task involving many factors and actors and whose end is always the product of the good work of its participants, to perform the rehabilitation of a symbolic building in Azca, like the one located at number 77 of the Castellana, is, architecturally speaking, similar to restoring a Rembrandt painting. What I exaggeration? What fell short? Well, a matter of opinions …

In any case, the tower whose construction was completed in 1977 and was designed by the architect Manuel Aymerich was avant-garde at the time, since it introduced something that is still costing us today. We speak of the glass facades with panels capable of capturing solar energy and a central core of reinforced concrete that supports the building, while it houses the stairs, elevators, toilets and facilities, in addition to counteracting the force of the wind.

After the purchase of the property by the GMP Group, which carried out the reform of the historic Castellana 81, it was decided by the company that it needed an “update”, thus beginning the rehabilitation that has made him to have the nickname of ‘Mutant Building‘, in addition to increasing its rental cost until it is located in the second most expensive in Madrid per square meter (there is that).

They counted for this task with the expert hands of the studio luis vidal + arquitectos, responsible for the fantastic image presented today by the building, composed of a facade with low emissivity glass and solar control, which is protected by some lamas of Efte that do not they only safeguard the interior from extreme solar conditions, they are also illuminated with their multiple Led´s devices (always Led´s).


It is clear that aesthetics is everything for a facade, so the current one, whose simplicity makes it impossible to visualize the complex execution, is a very important claim, so much so that the project has won an International Property Awards in the Office Architecture category from Spain. But that’s not all, the building has also obtained the Leed Gold Pre-certification, as a reward for its environmental responsibility during the design.

For those who do not know, the Castellana 77 is located in the most sought-after area of ​​the capital of Spain, along with emblems such as the Castellana 81 (former headquarters of BBVA), el Corte Inglés, the Picasso Tower and the largest Zara in the World (at number 79). But his condition was, at the very least, worrying, as Luis Vidal puts it: “Castellana 77 was the most degraded building in Azca, it was only, orphaned, it was the ugly duckling, a boring and decaying building. We have given it a new identity and we have revitalized this entire business area.”

The revitalization has modernized the interior facilities of the building, updating its 18 floors above ground and recovering for the use of parking four of the five floors of the basement, which can accommodate up to 200 vehicles, including places for electric vehicles, low emissions and 38 bicycles. The height of the building, 62 meters, allows developers to rent 16,289 useful square meters of the 21,000 built.

Of course, in Acciona, the main construction company, they must be very proud to have contributed to the works of this property that will receive the certification in accessibility DIGA (Distinctive Indicator of the Degree of Accessibility) created by the Shangri-La Foundation, with which they reward the maximum accessibility criteria for users and visitors and a use of its facilities in conditions of equality, security and comfort, an example.

But let’s go to the business, if you decide to rent your offices in Castellana 77 you should know that the air conditioning is produced by means of cold beams (cooling system by thermal exchange between columns of water and air) guaranteeing efficiency, a healthier air and much less noise, the lighting will be done through a DALI system (Digital Addresable Lighting Interface) providing the necessary light at all times, you will have 8 elevators, two that reach the basement floors and the rest from the ground floor at 17 and, no less important, you will have security 365 days a year for 24 hours.

Another factor to take into account is that the complex aims to achieve WELL certification in the Core & Shell category, if you are regular readers of the magazine you will already know that it is a certificate granted by the International WELL Building Institute ™ (IWBI) where buildings are evaluated depending on how they take care of their users from seven different areas: air, water, lighting, nutrition, promotion of physical exercise, comfort and mind. That the company aspires to this certificate is pleasant news, do not hesitate.

The company Iaso, responsible for the skin of Efte from abroad, tells us that 448 slats with dimensions of 1.52 by 0.60 meters have been placed according to a solar study based on the orientation of the facades (south, east and west ). The company Ferga, has been responsible for Efte’s supporting aluminum structures, these structures incorporate the unique led lights, capable of changing color according to the needs of the new Madrid icon.

This property has been given a second chance, among GMP developers, architects (Luis Vidal y cía) and the various companies involved in construction (such as Porcelanosa with its Krion, Vectoria with its engineering, Calter with its structures, Iguzzini with its luminaires, Noken with its sanitary ware or Shüeco with its experience in curtain walls). Now it’s up to users, the citizens of Madrid and visitors to enjoy this architectural feat.

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