Foster + Partners has completed "Ombú", a retrofit project of a 1905 gas plant, by the architect Luis de Landecho,  into an office building, designed for the Spanish infrastructure and energy company ACCIONA, unifying a mix of private and public land with green landscaping that extends to the adjoining Méndez Álvaro station, in Madrid, Spain.

Ombú has a 1.0 Planet Ecological Footprint, meaning its carbon emissions will be absorbed by the current capacity of the earth. According to the architects, “this achieves the balance of sources and sinks required by the Paris Agreement, with its environmental impact compatible with the original +2°C target".
Foster + Partners renovate over 10,000 square meters of office space accommodated inside the building, which according to the firm “breathes new life into a historic industrial building in Madrid, creating a sustainable exemplar of building reuse and revitalizing the surrounding area.”

Having fallen into disuse and with demolition looming, the building was acquired by ACCIONA in 2017 with the goal of repurposing it.

Foster's approach to the adaptive reuse project involved retaining the existing load-bearing structure supporting as well as the existing building envelope, which the team calculates has allowed conserved over 10,000 tons of brick.
 
“Ombú brings an industrial wasteland back to a new garden in the city. Madrid’s benign climate allows workspaces to be outside as well as inside, creating a flexible and desirable lifestyle. Natural materials are brought into the existing building, contributing to biophilic spaces that are good for wellbeing and productivity.”
Norman Foster, Founder and Executive Chairman, Foster + Partners.


Ombú complex by Foster + Partners. Photograph by Nigel Young.

The lightweight structure inserted inside the space is made from sustainably sourced timber from local forests and allows for spatial flexibility, while also integrating lighting, ventilation and other services. The timber structure will save more than 1,600 tonnes of CO2 and is recyclable and demountable. A central skylight brings natural light to the interior, reducing the need for artificial lighting, while the glazing incorporates photovoltaic technologies that generate electricity.
 
“The new design retains and enhances the original masonry structure, while upgrading other aspects of the building and extending its life by introducing new flexible workspaces - giving it a sustainable legacy for years to come.”
Taba Rasti, Senior Partner and co-head of the Madrid studio.

Taking advantage of Madrid’s temperate climate, a new courtyard offers the option to comfortably work outdoors. The courtyard connects to a large 12,400 square-metre park with 350 trees featuring outdoor working spaces and areas for informal meetings sheltered by a green canopy of trees. Local species have been carefully selected to reduce water consumption, which will come from local sources. The new green, public space connects the building with the surrounding community and generates a positive social impact. Located in the lively Arganzuela district, Ombú also benefits from direct access to rail and bus networks, encouraging employees to travel by public transport.


Sketch by Norman Foster. Ombú complex by Foster + Partners.

One of the most sustainable projects by Foster + Partners, the project was presented by Chris Trott, Head of Sustainability at COP26 in Glasgow as a case study for the World Green Building Council. Using the concept of Ecological Footprint, the impact of the project was quantified and improved across all aspects of the development; its carbon footprint has been carefully measured and controlled. The design reduces embodied carbon by 25 per cent when compared to a new build over the project's whole life while making allowances for future refurbishment. The operational energy is calculated to be 35 per cent below normal expectations.

ACCIONA’s vision for the future aligns with the practice’s commitment to developing bespoke design solutions that are optimised for their operations and the planet. Working closely with ACCIONA and the local collaborating architects Ortiz León architects, the practice has addressed sustainability holistically to realise this unique retrofit project and rejuvenate the surrounding area.

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Architects
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Foster + Partners.
Collaborating architect.- Ortiz León Architects.
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Design team
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Nigel Dancey, Taba Rasti, Pablo Urango, Emilio Ortiz Zaforas, Lucas Mazarrasa Chavari, Alfonso Aracil Sánchez, Sergio Canas Vadillo, Eduardo Cilleruelo, Alex Duro López, Miguel García Jiménez, Cesidio García del Río, María Soriano Rementería, Chris Trott, Arpan Bakshi, María de Miguel Garrido, Julia Pérez Torres, Martha Tsigkari, Sherif Tarabishy, Stamatios Psarras, Irene Gallou, Carlos Bausa Martínez, Byron Mardas, Alessandro Ranaldi, Martin Glover, Sarah Villar-Furniss, Luke Herring, Valeria de Giuli and Giulia Zanotti.
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Collaborators
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Structural consultant.- Acciona Ingeniería.
Mechanical engineers.- JG ingenieros.
Landscape consultant.- K8 Paisajismo.
Lighting engineers.- Artec 3.
Timber structure.- Enmadera (Miguel Nevado).
Façade.- ENAR (Envolventes Arquitectónicas).
Acoustics.- Margarida.
Planning consultant.- Addient.
Traffic consultant.- Clothos + Vectio.
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Client
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ACCIONA Inmobiliaria.
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Main Contractor
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Acciona Construcción.
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Area
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19,500 m².
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Dates
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Appointment.- 2020.
Completion.- 2022.
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Location
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C/ del Ombú, 6. Madrid, Spain.
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Photography
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Norman Foster is considered by many to be the most prominent architect in Britain. He won the 1999 Pritzker Architecture Prize and the 2009 Príncipe de Asturias de las Artes Prize.

Lord Foster rebuilt the Reichstag as a new German Parliament in Berlin and designed a contemporary Great Court for the British Museum. He linked St. Paul's Cathedral to the Tate Modern with the Millennium Bridge, a steel footbridge across the Thames. He designed the Hearst Corporation Building in Manhattan, at 57th Street and Eighth Avenue.

He was born in Manchester, England, in 1935. Among his firm’s many other projects are London’s City Hall, the Bilbao Metro in Spain, the Canary Wharf Underground Station in London and the renovated courtyard of the Smithsonian American Art Museum and National Portrait Gallery in Washington.

In the 1970s, Lord Foster was one of the most visible practitioners of high-tech architecture that fetishized machine culture. His triumphant 1986 Hong Kong and Shanghai bank building, conceived as a kit-of-parts plugged into a towering steel frame, was capitalism's answer to the populist Pompidou Center in Paris.

Nicolai Ouroussoff, The Times’s architecture critic, has written that although Lord Foster’s work has become sleeker and more predictable in recent years, his forms are always driven by an internal structural logic, and they treat their surroundings with a refreshing bluntness.

Awarded the Prince of Asturias of the Arts 2009.

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