Two Towers

90 Years Álvaro Siza

27 May – 5 July 2023

Friday, 26 May 2023, 6.30pm

Speaking at the opening
Dr. h.c. Kristin Feireiss  Aedes, Berlin
Francisco Ribeiro de Menezes Ambassador of Portugal to Berlin
António Choupina Architect and Curator, Porto
Henrique Siza Architect, Porto
Álvaro Siza Architect, Porto (video message)

Aedes Architecture Forum
Christinenstr. 18-19
10119 Berlin

Opening hours
Mon 1–5pm
Tue–Fri 11am–6.30pm
Sunday and public holidays 1–5pm
Sat, 27 May 2023, 1–5pm


Generously supported by

Aedes Cooperation Partners


powered by BauNetz

World-renowned architect, author, draughtsman, designer and artist, Álvaro Siza from Porto has in many ways (re)defined contemporary architecture. He set out a path that is both modern and historically rooted, international and site-specific, monumental and self-effacing. Siza has been honoured with the highest international awards and his work has been exhibited in major museums, leaving his mark all over the globe with buildings of all scales that have influenced the education of generations of architects.

One specific typology appeared to have eluded his seventy-year-long career: the tower. Through Siza's expressive sketches as well as photographs and models, this exhibition showcases the duality of two recently completed towers, which could not be more different despite their strikingly elegant simplicity: the deluxe residential tower of 611 West 56th Street, in the concrete jungle of Manhattan, and the eco-friendly watchtower of Proença-a-Nova, in the evergreen forest of Portugal. ­­Each one works as a lookout into the wonderful and endless landscapes of New York and Naturtejo, a UNESCO Geopark between Lisbon and Porto. After all, Álvaro Siza's towers are less about height and more about foresight.

The architect's presence is made tangible on the one hand by a life-size "Siza figure" and on the other hand by his chairs and tables designed for the Chinese furniture manufacturer and Aedes Cooperation Partner Camerich, which invite visitors to dwell in the exhibition and will be available for sale when it closes.

This coming June, Álvaro Siza celebrates his 90th birthday and yet continues to actively participate in the international discourse and design of our shared built environment.


Sketches of lamps and the tower in Proença-a-Nova © Álvaro Siza

Siza has designed several towers since 1979, yet most are unbuilt or unspoken projects. Perhaps because towers are a kind of taboo in his home country Portugal, so much so that they are considered illegal by nearly all city ordinances, or maybe because southern topography and climate favour a more telluric approach, which emphasizes horizontal lines. New York, on the other hand, is like a dream, where everything is vertical and thrusts from the ground like trees. That is how Álvaro Siza describes it since his initial trip to the United States, roughly half a century ago.

His newest tower in Manhattan (2014–22), standing at 137 meters tall, may seem modest in comparison to New York's ever-growing skyline, but it's enough to "caress the sky rather than scrape it", according to Siza. His towers are hence instruments for renewing and restructuring territories, such as the neighbourhood of 611W56, expanding vertically to make room for public spaces that allows for the social engagement of communities – on the corner of 11th avenue – and the implementation of garden areas – on the 2nd floor courtyard. The tower bears a vague resemblance to an anthropomorphic sculpture, its long neck and cantilevered head clad in limestone, with a double herringbone pattern. 

611W56 tower in Manhattan © João Morgado

The watchtower in Proença-a-Nova (2018–21) is powered by solar panels and rises at the summit of a mountain range called Serra das Talhadas. It might only be 16 meters tall, but it sits 616 meters above sea level, overlooking the 50-million-year-old quartzitic crests of the surrounding geopark. This tower is meant to prevent the spread of wildfires, besides also working as a belvedere at the summit of an ambitious rock-climbing trail. Álvaro Siza composed the watchtower with squared overhanging slabs and rounded corners. The floor plan distils the structure to its most essential shape: a cross grid, not unlike the neighbouring crucifix. 

An identical logic had been applied to 611 West 56th Street, where the Hippodamian grid of New York was translated onto the façade: avenues become pillars and blocks become windows. Both towers are strategically placed on the edge, perching above the entrance and opening their corners to shift whole panoramas inward, framed by glass in Manhattan or defying gravity in Proença-a-Nova.

Tower in Proença-a-Nova © João Morgado

The Exhibition

Sketches, 3D-mockups, models, and photos illuminate Álvaro Siza's passion for towers and his fascination with reaching for the sun, while simultaneously focusing on two case studies and their diverging traits: one is taller and the other is shorter, one is private, and the other is public, one is for dwelling, and the other is for protection, one is urban, and the other is rural, one is in reinforced concrete and the other in lightweight steel frame. The multimedia exhibition also includes interviews and objects designed by Siza in different contexts, like a set of rattan woven chairs designed for Camerich, an Aedes Cooperation Partner.

The exhibition is curated by architect António Choupina.

Self-portrait and sketches of the 611W56 tower in Manhattan © Álvaro Siza

Previous Siza exhibitions at Aedes

With the Two Towers exhibition, Aedes celebrates Álvaro Siza, but also closes a circle. Back in 1985, the Aedes Architecture Forum had already devoted a solo show to him, in which one of his first tower-schemes was presented: the design of a Memorial to the Victims of National Socialism, for the 1983 Prince Albrecht Palais Competition. Siza's architecture was also featured at Aedes in 2009, as part of the Portugal Outside Portugal exhibition. In recent years, Aedes displayed his remarkable Visions of the Alhambra in five different countries (2014–2017) and invited him to design the Pavilion for Camerich, on the occasion of the 2019 China International Furniture Fair (CIFF).

About Álvaro Siza

Two Towers commemorates the 90th anniversary of Álvaro Siza (1933), one of the most important living architects and a major contributor to contemporary architecture. Siza is famous for his handmade sketches, in which he captures complex situations in order to ease their understanding and resolution. They establish a dialectic rapport between his creative intuition and the material detailing of quality construction. He is also one of the most awarded architects in the world, winning the first-ever Mies van der Rohe Award for European Architecture (1988) and Mies Crown Hall Americas Prize (2014), as well as the renowned Pritzker Prize (1992), the Praemium Imperiale (1998), the Wolf Prize (2001), the Golden Lion for Lifetime Achievement (2012) and the Gold Medals from the Alvar Aalto Foundation (1988), Royal Institute of British Architects (RIBA, 2009) and International Union for Architects (UIA, 2011), to name just a few. 


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