+K Architects Opens Up a São Paulo Building with Pivoting Glass for Greenpeace Brazil's Headquarters

An environmental organisation that moves into a sealed glass box has a credibility problem. For the Greenpeace Brasil headquarters in São Paulo, +K Architects, led by architect Keila Costa, took the more useful route. They kept an existing urban building, removed its fixed glazing, and reworked roughly 2,250 m² across a ground floor, two upper office floors and a roof. The project was completed in 2015. It does not use a new structure to make its argument; it reuses what was already there.

The most interesting decision is also the simplest one. The original fixed panes were replaced with vertical pivoting glazing, the kind usually sold to enclose apartment balconies. That glazing went into every opening, so the ground floor and both upper floors can now be cross-ventilated. An off-the-shelf residential product becomes the main climate strategy for an NGO office. We think that is a smarter statement about sustainability than most purpose-built green headquarters manage.

A Glass Front That Gives Way to Vines

From the street, the building does not look like a corporate headquarters. It is a two-storey glazed front sitting under São Paulo's tangle of overhead wires, next to a large mural, with climbing plants growing up its face. At dusk, the lit interior shows through the vines, so the façade reads as a screen of greenery more than a sheet of glass.

Black steel brackets project from the façade and carry the vine strands. They are a minimal intervention, but they let a planted layer grow in front of the glass without the cost of a full green wall. The graffitied shutter below has been left as it is, which keeps the building tied to its street.

Pivoting Panes and Open Edges

Looking up the façade, the Sanglass panels reflect the sky behind the steel brackets and foliage. Inside, the same panels are shown pivoted open. The corner of the office then has no closed edge at all, and heart-leaved vines hang between the desks and the apartment blocks next door.

Opening the windows from floor to ceiling raises a safety issue, and the architects dealt with it plainly. Carbon steel guardrails strung with steel cables run along the openings on the ground and upper floors. The cables are thin enough to keep views and airflow almost unobstructed. A small meeting nook with a green armchair sits behind one of these railings, and the photograph of it in afternoon sun shows how much light the building now takes in.

Ground Floor: Bikes, Books and Messaging

The ground floor starts with bicycle parking, tactile paving and potted plants. For this client that order makes sense: arriving by bike is treated as the normal way in, and nobody needs to apologise for it.

Text and images cover much of the interior surfaces. A photo wall runs beside the elevator, a typographic wall faces the bike racks, and lettering is painted along the stairwell. Timber crates serve as bookshelves and pallets serve as tables. The organisation's campaigning identity is therefore placed in the fabric of the building, so it does not need to be added later as branded signage.

Open Floors Organised Around Work Islands

Upper Floors 1 and 2 follow a clear arrangement. Team work islands occupy the open plate, and the enclosed rooms are grouped on the side with the stairs and toilets. Because the enclosed rooms are concentrated with the services, the rest of the floor stays continuous from façade to façade. That continuity is what lets the cross ventilation work.

A green speckled floor runs through the entire plan, while services stay exposed overhead and linear pendants light the desks. The white columns of the existing structure remain visible. The finishes are restrained, so the open floors read as working space rather than as a designed showcase.

Steel-Framed Glass Rooms

The new rooms are defined by glass partitions set in carbon steel frames. Some panels are clear and some are frosted. Each room becomes a separate acoustic space, but none of them blocks the sightline along the floor. A person walking past a meeting room full of orange and red chairs is still part of the office's activity.

Where the program needed real separation, the architects changed the material. Technical rooms, which require stronger acoustic and visual isolation, use acoustic plaster partitions. Glass is used where openness is useful and plaster where it is not, and this kind of honest, need-based detailing runs through the whole scheme.

Rooms with a Point of View

Not every room is a standard meeting room. A tatami lounge with floor cushions and a teal pouf sits behind black-framed glass, and its sliding door opens toward windows where vines climb the wires. It gives staff a low, quiet place within an otherwise busy office floor.

One photograph shows a person in a yellow protective suit holding a banner behind a meeting-room door. It is a reminder that these rooms host campaign planning, not only budget reviews. The transparent partitions put that work on display throughout the office, which suits an organisation whose activity depends on being seen.

Reclaimed Furniture and Communal Tables

The mismatched colourful chairs, reclaimed timber tables and pallet seating could easily become clichés of an eco office. Here they work because the architecture behind them is just as unfussy. One meeting table looks out over a balcony of red-leaved plants and a tiled roof. A long corridor-like meeting space is lined with large photo murals of the organisation's campaigns.

The roof was intended to take this communal idea further, with an open multipurpose room under a retractable cover and a garden designed by landscape designer Luisa Mellis. That stage was only partly built and the garden was not realised. Solar panels for clean energy were installed on the roof. The unbuilt roof room is a real loss, because it was the space most likely to bring the whole organisation together.

Plans and Drawings

The plans show what the photographs only hint at. The site holds a main building and a rear block with a green courtyard between them. On the two office floors, desk rows fill the open plate and the enclosed rooms are pushed to one side. The upper plan shows the planted rooftop as it was designed. The sections show a narrow five-level volume next to a smaller pitched-roof block. Red figures and birds are drawn into the pale sky, a lighthearted touch that matches the tone of the interiors.

Why This Project Matters

Many sustainable workplaces depend on new construction, certification checklists and expensive envelopes. This headquarters makes its case through subtraction and substitution. The existing building stays. The sealed glass is replaced with pivoting balcony glazing so the occupants can open it. Steel, glass and plaster are each used only where they are needed. The overall result is modest, and that modesty is consistent with what the client campaigns for.

The project also shows how an organisation's identity can be expressed through how a building performs as well as how it looks. Vines on wires, cross breezes and bikes at the entrance communicate more about Greenpeace's priorities than a dramatic form would. For architects working on retrofit offices in dense, warm cities, the lesson is direct: an operable window remains one of the most effective climate tools available, and it is easy to source.

Greenpeace Brazil Headquarters by +K Architects (architect Keila Costa; collaborators João Pasqua and Mariana Hiroki). Location: São Paulo, Brazil. Area: 2,250 m². Year: 2015. Structural engineering: Favale Associados Engenharia. Facilities engineering: Sandretec Engenharia. Landscape design: Luisa Mellis. Photography: Ana Mello.

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