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Exposed reinforced concrete surfaces articulated through deep horizontal balconies and vertical circulation cores define the structural expression of this multi-story residential tower photographed…

Kaiserstrasse Residential Building by Nicholas Alencar is a highly esteemed winner of the very prestigious 2026 Bronze A' Design Award in Architecture, Building and Structure Design Competition Category.


BronzeArchitecture· 2026

Kaiserstrasse Residential Building

by Nicholas Alencar

Client: Alencar

Bronze A' Design Award Winner in Architecture Category

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Verified Award Winner

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The Design

About Kaiserstrasse Residential Building

Kaiserstrasse is a seven unit residential building in Blumenau, Brazil, that redefines urban living by merging the privacy of a house with the advantages of vertical housing. Each full floor apartment opens to expansive terraces, private pools, and integrated planters, transforming the facade into a vertical garden. The open ground floor invites interaction with the city, while the communal rooftop offers shared leisure and panoramic views, balancing privacy, community, and sustainability.

The Recognition

About the Bronze A' Design Award

Kaiserstrasse Residential Building is a Bronze A' Design Award winner, a highly prestigious recognition granted to outstanding designs distinguished by creativity, ingenuity, and astuteness. Bronze winners are amply skillful and strikingly creative artifacts that authenticate the vast experience, imagination, and resourcefulness of their designers. Kaiserstrasse Residential Building is expected to be a highly regarded, admired, and cherished object that is notably professional and innovative. This Bronze A' Design Award-winning design incorporates best practices in art, science, design, and technology, and is excellent for its attention to detail. Kaiserstrasse Residential Building splendidly satisfies needs, touches desires, charms feelings, and appeals to curiosity.

Interviews

Grand Interview

The Kaiserstrasse Residential Building has been recognized with a Bronze A' Design Award in the Architecture, Building and Structure Design category, a prestigious acknowledgment that speaks to the depth of thought behind every layer of this project; could you walk us through the single design decision in Kaiserstrasse Residential Building that you are most proud of, one that perhaps the award jury may not have fully been able to appreciate from drawings and photographs alone?

The design decision I am most proud of is probably the one that is hardest to capture in photographs. It is not found in the building’s form but in what it gives back to the city.For decades, Brazilian vertical housing has been shaped by a logic of separation. Walls, fences, setbacks, and barriers have created buildings that engage very little with public space. With Kaiserstraße, we sought to move in the opposite direction. We opened the ground floor. We allowed the landscape to flow through the site. We created a building that begins not at the apartment door, but at the sidewalk.Architecture should not exist solely for those who live within it. It should also generate value for those who pass by.If there is something the jury may not be able to fully appreciate through drawings and photographs alone, it is precisely this urban dimension. The building was not conceived as an object. It was conceived as part of a larger system called the city.

Urban density and the erosion of private green space are among the most pressing conversations in contemporary housing design, and the Kaiserstrasse Residential Building seems to answer both challenges simultaneously; in what ways do you believe this project reframes what residents in Brazilian cities can reasonably expect from vertical living, and how does that expectation shift the responsibility of the architect?

Urban densification is inevitable. The question is not whether we will build denser cities. The question is what kind of city we choose to build.For a long time, vertical living has been associated with a loss of quality of life: less nature, less space, and less connection to the outdoors. Kaiserstraße emerged from an attempt to challenge that assumption.I believe that living at height should not require giving up the qualities we traditionally associate with a house: natural light, cross ventilation, vegetation, privacy, and a connection to the sky.Perhaps the role of the contemporary architect is precisely this: to ensure that increasing density does not come at the expense of quality of life.The cities of the future will need to accommodate more people. But they will also need to become more humane.

The integration of mature trees growing directly from structural slabs in the Kaiserstrasse Residential Building is a technically ambitious gesture that most developers would avoid entirely; could you describe the structural and horticultural research that made this possible, and what does the long-term relationship between those living trees and the building's concrete skeleton look like over decades of growth?

The trees at Kaiserstraße are not decoration. They are infrastructure.There is a tendency to view vegetation as a complementary element of architecture. I believe exactly the opposite. In many cases, it is just as important as the structure itself.To make this vision possible, we developed structural studies, adequate soil volumes, drainage and irrigation systems, and carefully selected plant species. Yet the most interesting aspect is not the engineering required to plant the trees. It is the acceptance that they will continue shaping the building long after construction is complete.Concrete ages. Trees grow.Over the coming decades, the façade will be transformed by life itself. Perhaps that is one of the project’s greatest lessons: understanding that architecture is not static. It is a living organism that evolves alongside time.

Read the Full Interview

Behind the Design

Press Kit

Credits, team members and technical details provided by the designer.

Unique Properties
Kaiserstrasse is a seven-unit residential building that redefines urban housing by blending the privacy and richness of a house - verandas, courtyards, vegetation - with the advantages of vertical living. Each unit occupies a full floor, with private outdoor spaces and mature trees growing from the slabs. Located on a historic avenue once lined with villas, the building uses parametric design to create stepped, dynamic forms that maximize natural light and airflows.
Dimensions & Packaging
Total built area: 4,973 square meters. The building rises with a stepped form, housing seven full-floor apartments with terraces, private pools, and integrated vegetation. Structure: cast-in-place reinforced concrete. Façade: floor-to-ceiling glazing with brise-soleils. Features include natural cross ventilation, smart irrigation, and communal rooftop amenities.
Tags
Residential, Building, Architecture, Brazil, Residential Building, Residential Architecture, Vertical Garden, Parametric Design, Adaptive Layout, Private Pools
Production Technology
The project was realized through cast-in-place reinforced concrete combined with integrated planters in the slabs. Parametric design tools guided solar and ventilation studies, ensuring environmental performance. Structural cores and minimized internal load-bearing walls enabled open, adaptable layouts. Local, durable materials with low embodied carbon were prioritized.
Design Challenge
The greatest challenge was reconciling strict setback regulations with the desire for generous terraces and openness. Instead of limiting the design, the rules shaped its sculpted form. Additional challenges included integrating mature trees into structural slabs, balancing privacy with community, and ensuring sustainability with local construction techniques.
Research
Applied architectural research focused on integrating house-like qualities into high-density housing. Objectives included maximizing light, ventilation, and biodiversity. Methods: solar studies, parametric modeling, and structural experimentation. Data came from environmental simulations and code interpretation. Results: adaptable layouts, reduced energy demand, and a façade as a living vertical garden. Insights highlight sustainable, community-oriented urban housing.
Inspiration
The project was inspired by the historic avenue once lined with villas, where gardens and verandas defined daily life. The motive was to reinterpret these qualities—privacy, openness, vegetation—within a vertical structure, blending the comfort of a private house with the convenience of urban apartment living. Strict setback regulations also shaped the building’s sculpted, stepped form.
Project Duration
The project started in 2020 in Blumenau, Santa Catarina, Brazil, and was completed in March 2025. Located on Alameda Rio Branco, one of the city’s most historic avenues, the building embodies a contemporary reinterpretation of the street’s traditional villas while proposing a new vision for urban living.
Operation Flow
Each resident experiences the privacy of a house with the benefits of collective living. Apartments flow seamlessly from interior to large terraces and pools, creating indoor-outdoor living. The open ground floor reconnects the building with the city, while the shared rooftop offers leisure and gathering space, encouraging community interaction.
Image Credits
Image #1: Leonardo Finotti, Kaiserstraße, 2025
Image #2: Leonardo Finotti, Kaiserstraße, 2025
Image #3: Leonardo Finotti, Kaiserstraße, 2025
Image #4: Leonardo Finotti, Kaiserstraße, 2025
Image #5: Leonardo Finotti, Kaiserstraße, 2025

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