Le Corbusier’s Centrosoyuz Building: why ‘exact breathing’ was abandoned and what happened to the façade

Le Corbusier conceived the Centrosoyuz Building on Myasnitskaya Street in Moscow as a large office building in which the movement of people, the design of the façade and the supply of air would work together. The boldest part of his vision — an ‘exact breathing’ system with so-called neutralising walls — was never built. The Le Corbusier Foundation attributes its omission to the Soviet client’s lack of the necessary technology; a 2022 historical and cultural expert assessment independently confirms that the architect’s planned heating and ventilation system remained on paper.

The original design already alternated glazed sections with tuff: the stone cladding was never intended to replace all the glazing. During construction, the building’s outer envelope and heating system were altered, while the raised volumes, ramps and broad expanses of glass were retained. The window frames and glazing were changed again during later renovations; today’s façade brings together designs from different periods.

What brief did Centrosoyuz give the architects?

The client needed a large administrative complex with more than just offices. According to the Le Corbusier Foundation, the brief called for workplaces for around 2,500 staff, along with spaces for dining, meetings, a library and physical exercise. At this scale, managing movement and the indoor climate was a practical challenge: thousands of people would enter different buildings each day, work and use the shared spaces.

In Le Corbusier and Pierre Jeanneret’s design, the complex’s functions were divided among several sections. Some buildings were intended for management and commercial departments; others housed a club, canteen, library, workshops and support services. The architects sought a layout that would connect these sections without a long succession of enclosed stairwells. The Le Corbusier Foundation describes three office blocks raised on supports and a system of ramps conceived as a continuous route through the floors.

Extensive glazing brought daylight into the offices, but called for protection against overheating in summer and heat loss in winter. Le Corbusier proposed addressing both through an air circulation system within the outer wall. The form of the glass façade depended on whether the engineers and builders could realise his design.

The path to this solution began with the competition brief. In May 1928, Nikolai Popov, director of Centrosoyuz’s Paris office, invited Le Corbusier to enter the competition. According to the architect’s foundation, the client required a monumental entrance from Myasnitskaya Street and reinforced concrete for the load-bearing walls and floors, but left the character of the façades to the entrants. A Moscow expert assessment from 2025 records three rounds and 32 submitted designs. The glass envelope was therefore not a prescribed element of the brief: the architects proposed its form themselves.

The original programme brought together spaces with different functions. The foundation divides them into four groups: management, accounting and planning; commercial departments; a club, restaurant, library and medical station; and workshops, garages and other services. With a projected staff of around 2,500, the scheme called for distinct building volumes and connections between them, rather than a uniform row of offices. The ramps, ground-floor columns and connecting passages addressed precisely this need to manage the flow of people.

The foundation records three versions. The original design for the Centrosoyuz building — the 1928 competition entry — provided for heating and ventilation in the hall and ribbon windows on the office façades. Researcher Jorge Torres Cueco established this sequence from archival drawings and correspondence. The idea of turning large sections of the façade into a more continuous glass surface and heating the space between the layers of glazing emerged during further development, after Le Corbusier’s visit to Moscow in autumn 1928. This research helps us avoid attributing the later technical scheme to the original competition sketch.

What did Le Corbusier mean by ‘exact breathing’?

Le Corbusier’s ‘exact breathing’ system addressed two related but distinct tasks: regulating the temperature of the building’s outer envelope and supplying conditioned air to the rooms. An archival axonometric drawing held by the Foundation, labelled FLC 15690, shows the ‘neutralising walls’ developed by the architect with Pierre Jeanneret, alongside a separate ventilation scheme by engineer Gustave Lyon. This account is published by Torres Cueco on the basis of this drawing; neither system operated in the completed Moscow complex.

In Le Corbusier’s design, the neutralising walls consisted of two layers of enclosure with a sealed cavity between them. Dry air was to be circulated rapidly through the cavity: warm in winter and cold in summer. The enclosure could be transparent or include opaque sections. Supplying air to the rooms themselves required a separate circuit. If the air inside the double wall is confused with the air supplied to staff, the point of the design is lost: the architect sought to control both heat transfer through the façade and air exchange within the building.

In a note written after his October 1928 trip to Moscow, Le Corbusier asked Pierre Jeanneret to reconsider the entire window system and explore whether more of the surface could be glazed, with the space between the two panes heated. A researcher cites another archival sheet, FLC 16049, which proposes circulating air through the cavity between the layers of a glass or stone-clad wall. Both documents show how the design was developing, but neither confirms that the client approved equipment capable of putting it into practice in Moscow.

For one proposed air supply option, the study gives a design figure of 80 litres per person per minute at 18 °C. This figure relates to a calculation shown on the drawing, not to measured air exchange in the building on Myasnitskaya Street. The archival annotations help convey the scale of the engineering ambition; without further calculations, they cannot be compared with current standards or used to draw conclusions about how comfortable the staff actually were.

The term ‘neutralising walls’ described how the building envelope was intended to work, not the pink stone on the façade. The Fondation Le Corbusier describes an alternation of transparent and solid sections incorporating tuff in the original design. It would therefore be wrong to assume that the plan called for an entirely glass façade until the engineering concept was rejected, or that all the stone was added later. Abandoning the concept deprived the façade of its intended climate control system and affected the development of the glazing; the precise origin of each solid section must be established from individual drawings, not from the colour of the wall.

Why was the Centrosoyuz building’s design changed, and why was ‘exact breathing’ abandoned?

The Moscow client rejected the proposed heating and ventilation system before construction was completed. The Le Corbusier Foundation attributes the decision to the lack of the necessary equipment; a report by Moscow experts notes that air conditioning was not in use in the country at the time. Archival correspondence examined by Jorge Torres Cueco reveals more about the dispute: Centrosoyuz’s leaders doubted both the system’s technical feasibility and the cost of operating it.

The earliest dated expression of doubt cited in the study is a letter to Le Corbusier from the chairman of the board, Isidor Lyubimov, dated 13 February 1929. At the time, the Moscow bureau was revising the plans sent from Paris. The proposal was not rejected after the façade had been completed: the questions of glazing and air circulation were being discussed alongside the working drawings. In October 1929, the bureau’s staff stated explicitly that they had decided on ribbon windows. Telegrams sent in December recorded objections to continuous glazing and the proposed heating system.

Le Corbusier did not consider the dispute settled. In early 1930, he asked the American engineering company American Blower Corporation to calculate the system’s requirements. According to a study of the archival correspondence, the company’s reply of 24 January estimated that the system would require roughly four times as much steam and more than twice the drive power of conventional heating and ventilation methods for a comparable building. This was a calculated estimate of the proposal, rather than the result of measurements taken at the completed Centrosoyuz building.

The engineers also raised questions about operation and maintenance, and expected summer cooling to require a much greater volume of air than winter heating. According to the same study, further consultations with Gustave Lyon and the glassmaker Saint-Gobain did not resolve the technical doubts. Another pane of glass was proposed to create a second, sealed air gap. This would have made the façade more complex; the published correspondence does not allow the costs of installing and maintaining it to be assessed separately.

Torres Cueco also presents the architect’s response: Le Corbusier continued to insist on continuous glazing and air circulation systems, tried to contact Lyubimov, and asked Nikolai Kolli to support the project. By February 1930, the parties were disputing the drawings for the windows and heating. The documents give two reasons for the rejection: the technical capabilities of the Moscow building site and the operating costs. American Blower’s calculations concerned a specific proposal; they do not prove that such a system would have been impossible under all circumstances.

The building was designed on both sides of the border. Le Corbusier’s Paris studio produced the façades, plans and some of the details; the general construction, structural and technical working drawings were prepared in Moscow under Nikolai Kolli’s direction. The foundation reports shortages of materials and delays on site, as well as a visit by Charlotte Perriand, who told Le Corbusier about difficulties with the planned polychromy. These circumstances show why the architectural vision depended on the work of many people, but they do not replace the documented account of the dispute over the climate control system.

What does the completed façade look like after the system was abandoned?

In the completed Centrosoyuz building, glass stands alongside solid walls clad in tuff. The expert assessment distinguishes three types of glazing: continuous glazed surfaces, ribbon windows and individual window units. It specifies tuff from the Artik deposit in Armenia for the cladding. Describing the building as a continuous ‘glass palace’ overlooks the differences between sections of the façade.

The expert assessment records the measures actually used to regulate the indoor environment: radiators were installed along the external walls, while two sets of curtains provided protection from the sun, one between the panes of glass and the other on the room side. In the completed building, heat and light were managed without the originally proposed sealed ‘exact breathing’ system. The presence of curtains alone, however, cannot tell us how comfortable the building was to work in across the seasons; that would require measurements or accounts from its occupants.

The building’s plan also helps explain its façades. According to the 2025 assessment report, a seven-storey office wing stretches along Myasnitskaya Street. At either end, it adjoins an eight-storey wing with a blank end wall facing one of the main streets. On the side facing Academician Sakharov Avenue, a horseshoe-shaped club wing projects outwards, with a glazed gallery on the second floor and the solid wall of an auditorium. The rooms’ functions also shaped the balance between glazed and solid areas.

The same report describes each side of the office wing under examination: one long elevation has double-glazed panels in a metal frame, while sections of the opposite façade alternate between continuous and ribbon glazing. Almost square windows face Myasnitskaya Street. These observations describe the condition recorded by experts in 2025; they do not establish that the frames and glass now in place are original to the 1930s. The shape of the openings, the construction of the frames and the heating arrangements behind them must be considered separately.

The Moscow assessment report identifies Artik tuff as cladding on some of the brick and reinforced concrete walls, alongside plastered surfaces. The Le Corbusier Foundation links the stone infill to the abandonment of the planned engineered envelope and notes the transfer of heat through the material. This describes the architect’s design rationale; the cited documents contain no measurements that would establish a specific heat saving for any particular tuff-clad surface. The stone itself, the texture of its joints and its relationship with the glazing can be examined on site, but the effectiveness of the proposed alternative cannot be established without measurements.

The radiators along the external walls were no chance later addition. Torres Cueco describes drawings from January to April 1930 in which the architect was already incorporating conventional heating into the solid sections of the façade, while retaining the large glazed areas without the air ducts of the original scheme. A drawing dated 20 May 1930 specified the spacing of the heating units. The expert assessment confirms that radiators were installed in the completed interiors, but does not establish that their positions matched every drawing exactly. These changes took shape through a series of intermediate decisions; the façade was not redesigned all at once.

Le Corbusier himself later wrote that, without the ‘exact respiration’ system, the glazing of the Moscow building looked less cohesive. The Foundation quotes this assessment by the architect from the first volume of his collected works. It helps explain his dispute over the façade, but cannot replace the construction records: the large glazed surfaces at the Tsentrosoyuz building were built after all. What was abandoned chiefly concerned the performance of the building envelope and the detailing of the windows.

Which changes were not directly related to ‘exact breathing’?

In 1932, the unfinished complex was transferred to the USSR People’s Commissariat of Light Industry. According to the expert assessment report, after the change of occupant, the large operations halls were divided into individual offices on either side of a central corridor. The building’s overall composition and principal structural features were preserved. The source states the reason for this change in layout plainly: a new occupant and a different way of organising work. It would be wrong to attribute the change in layout to the abandonment of the climate control system.

Circulation inside the building changed too. The report describes how, during construction, a single flight of stairs was added at the lower level to the symmetrical ramps Le Corbusier had designed for the club section. From the stair’s upper landing, the ramps led off in opposite directions. This change concerned the organisation of the interior space, rather than the façade cladding. It is a reminder that a ‘design’ comprises many decisions: the overall concept was retained, while individual details were revised.

On Myasnitskaya Street, part of the space beneath the block raised on columns was enclosed during construction. Le Corbusier had intended to leave much of the ground level open, but the Moscow assessment report records the infill that was built. When viewing the building, it is important to distinguish the open bays from the enclosed sections: this change cannot be explained by the abandonment of the climate control system.

The documents reveal another compromise made in 1929. According to a letter from Nikolai Kolli dated 2 May, examined by Torres Cueco, the Moscow bureau adjusted the position of Block A: the site could not be enlarged, so one proposed arrangement at right angles to the street had to be revised. Le Corbusier did not consider this shift sufficient reason to halt the work, although he continued to dispute the approach to the windows and heating. This allows us to distinguish a concession dictated by the site boundaries from his resistance to changes in the climate control scheme.

The cellular office layout for the People's Commissariat of Light Industry was given its own interior finishes. Nikolai Kolli described the corridor in detail; a 2025 report records his account: the lower walls were clad in light oak, walnut was used on one floor, and above the panelling was frosted glazing set in oak frames. The new finishes reflected the revised arrangement of the rooms. They had no connection with the decision to abandon the double wall with air circulating through it.

Which parts of the original design were preserved?

The ventilation system that was never built did not prevent other ideas of Le Corbusier’s from being realised. Experts cite the raised ground floor, flat roofs, ribbon windows and continuous glazing, and a double-height entrance hall with ramps among the features that were built. The Le Corbusier Foundation also emphasises the importance of these rising passages: they were intended to guide movement through the large building and connect its different levels along a continuous route.

Assessing individual features requires both a view from the street and documentary evidence. From Myasnitskaya Street, you can see the relationship between the glazed surfaces and those clad in tuff, the building’s large volumes, and parts of the ground-floor supports. The interior ramps and the layout of the entrance hall cannot reliably be described as features seen from the pavement; their existence and state of preservation are confirmed here by an expert assessment report. The presence of historic passages does not mean that the working building is open to the public.

A 2022 report records ventilation, heating and air conditioning systems in the Tsentrosoyuz building; some of the equipment needed upgrading at the time. The experts described the building’s condition decades after its construction and did not link the installed equipment to the design shown in drawings from the late 1920s. Over the intervening years, the building’s occupants, window frames and mechanical systems had changed.

The ramps had a spatial purpose that can be traced in the evidence. The Le Corbusier Foundation describes an architectural promenade through six floors, while archival drawings discussed by Torres Cueco document the exploration of two continuous horseshoe-shaped routes. One section extended outside and appeared as a curved volume beside the rectangular blocks; the other shaped the view through the double-height entrance hall. A magazine in 1933 even presented the Tsentrosoyuz building as a ‘building without stairs’. This evoked the architect’s vision rather than literally describing the completed building: an expert assessment lists both conventional flights of stairs and ramps.

The survival of the ramped passages is confirmed by more than historic images. The list of protected features, approved by the Moscow department in 2012 and cited in a 2025 report, includes their location and construction, along with the reinforced concrete frame, staircases and lifts. Experts also note surviving elements of the finishes: woodwork, artificial marble and natural marble. These details make it possible to assess how much of the interior survives by examining its structures and materials, rather than relying on a general impression of the façade.

Why do sources give different dates for the building’s completion?

The different dates refer to different stages of a lengthy construction project. The Fondation Le Corbusier states that the offices came into use in 1934 and the club was finished in 1935. A Moscow report provides further detail: in 1933, work continued under a team led by Nikolai Kolli; by the end of 1936, most of the office blocks and the entrance hall had been handed over; construction was completed in 1939, and the finishing work throughout the building was completed in 1940. Saying simply that ‘Tsentrosoyuz was built in 1935’ compresses this sequence too far.

This chronology helps avoid projecting the building’s later condition back onto the period when its climate control system was being designed. The principle of ‘exact breathing’ was discussed in the plans of the late 1920s; by the mid-1930s, when some rooms had come into use, the proposed system had still not been installed. Changes to the layout, completion of the club section and subsequent finishing work each followed their own timetable. Distinguishing these stages explains the differing dates without forcing a single ‘year of construction’ onto the entire complex.

Where did the architect eventually put ‘exact breathing’ to the test?

The Salvation Army’s Cité de Refuge shelter in Paris was the next attempt to create a sealed building with forced air supply. According to the Fondation Le Corbusier’s records, the building opened on 7 December 1933. Between June 1929 and June 1930, the architects prepared five designs; the final version omitted two wings to reduce construction and heating costs. The Foundation explicitly links the Paris project to the unrealised proposal for Moscow.

The history of Cité de Refuge reveals the limits of the original idea. The Foundation reports that, as early as 1935, sections of the shelter’s south-facing glass façade were made openable to reduce the temperature behind the glazing. Following wartime damage, the glazing was replaced between 1948 and 1952, and a sunshade was added in front of the multicoloured frames. This does not prove that exactly the same problems would have arisen on Myasnitskaya Street: the climate, the use of the rooms and the way the buildings were constructed differed. Yet the example makes it impossible to present the unbuilt Moscow proposal as a technical solution whose success was assured in advance.

A research team at the University of Seville, in a study of the neutralisant wall, compared Saint-Gobain’s 1931 tests with computer modelling. The authors treat the combined operation of the two proposed systems as an engineering hypothesis and emphasise that the original design for the Paris shelter was never fully realised. This assessment does not contradict the Foundation’s account of the airtight building that was actually built; it calls for a distinction between the ventilation as built, the ideal double-wall scheme and later changes to the façade. The model’s findings cannot be applied to Moscow’s Centrosoyuz building without technical data specific to that building.

The Cité de Refuge shelter was designed to provide overnight accommodation for around 500 people, along with dining facilities and workshops; the building on Myasnitskaya Street was designed for 2,500 employees. The Le Corbusier Foundation records both programmes. Differences in purpose, numbers of users and how the spaces were used limit comparisons between the buildings: overheating behind the glass in Paris is documented, but tells us nothing, in itself, about temperatures in the Moscow offices.

Which documents allow us to distinguish the design from the building as built?

The main sequence of events can be reconstructed from documents of different origins. The Le Corbusier Foundation holds the architect’s drawings and presents the studio’s perspective. Torres Cueco’s publication brings into the discussion letters from Lyubimov, Kolli and the engineer Paul Nachman, along with consultants’ replies from 1929–1930. Moscow expert assessment reports from 2022 and 2025 describe the building as constructed and subsequently altered. Each source answers a different question: the drawings show the design intent, the correspondence traces the approval process, and the surveys record the building’s physical condition.

Even a drawing’s caption needs checking. Torres Cueco notes that the axonometric drawing FLC 15690 is marked ‘Paris, 1928’, although Albert Frey produced the sheet on 21 February 1929. That does not mean the concept was a later invention: in a note to Pierre Jeanneret after his trip to Moscow in autumn 1928, Le Corbusier had already raised the question of heating the air between the panes of glass. Yet the date on the sheet is not necessarily the date when every detail shown on it was conceived. When comparing the competition design, the later scheme of air circuits and the façade as built, a difference of a few months changes the chronology of the design.

The 2025 assessment identifies the building’s protected features: its overall form as it stood in 1934, the balance between glazed and solid wall surfaces, the character of its tuff and plaster finishes, its open plan and the position of its ramps. This sets a limit on what can be concluded: the document recognises the value of the building and its historical layers, but does not establish that every proposal made by the Paris studio in the late 1920s was carried out. A restoration document cannot be taken as proof that a climate-control system which was never built once existed.

How can you read the Centrosoyuz Building from the street?

Three layers can be distinguished in the history of the Centrosoyuz building’s façade at 39 Myasnitskaya Street. The first is the architect’s composition of large volumes, supports and expansive glazed surfaces. The second consists of decisions made during construction: the installation of the tuff cladding specified in the design, the addition of radiators and curtains, and alterations to parts of the lower level. The third comprises later window replacements and restoration work. The radiators and curtains are known from documents, not from a view from the pavement; the building’s appearance must be considered alongside the drawings and official records.

According to expert assessment reports, in the 1960s the Centrosoyuz building’s wooden and metal window frames were replaced with aluminium ones, except on the basement level, while retaining the original glazing pattern. According to the Le Corbusier Foundation, substantial aluminium frames were added to the club section and glazed façades during the 2012 reconstruction, while some ground-level supports were enclosed or turned into fluted columns. The building’s present appearance therefore makes it impossible to date every detail or assess how well the original pillars have survived.

The 2025 report states that, during work carried out in 2014 on the part of the building occupied by Rosstat, the windows and continuous façade glazing were replaced again, the Artik tuff cladding was restored, the foyer gallery was reopened and later partitions were removed. These details describe only the section that was surveyed. The condition of the rest of the building’s exterior and interior cannot be inferred from the list of work carried out for Rosstat.

The project reviewed by experts in August 2025 calls for the tuff to be cleaned and restored, later fixings and external air-conditioning units to be removed from the façades, and the texture of the decorative plaster on the columns and ramp walls to be restored. These are planned works, not evidence that they had all been completed by September 2026. What matters to readers of the document is how the task is framed: specialists distinguish historic material from later additions and areas requiring restoration; a uniform façade colour does not, in itself, establish its authenticity.

There are limits to what can be observed from the street, too. From Myasnitskaya Street, you can take in the long office façade, the proportion of glazing, the solid end walls and the open spaces beneath the building’s wings. The club section faces Akademika Sakharova Prospekt and has a different façade. But no vantage point on the pavement reveals the ducts of the rejected system, the condition of the old interior partitions or precisely which window frames were replaced. Those questions require design documents and survey reports; the façade prompts questions rather than providing ready-made technical answers.

The Centrosoyuz Building retains the volumes, supports, ramps and large expanses of glazing conceived by Le Corbusier. The air system within the double wall remained on the drawings; the radiators and altered glazing show how heating and lighting needs were addressed during construction. Letters from 1929–1930 explain the dispute between the architect and the client, while expert assessment reports help distinguish construction decisions from later frame replacements and repairs to the cladding.

You can see the Centrosoyuz Building alongside buildings from other eras on the ‘Architecture, Moscow Style’ route from the Red Gates to the Yauza Gates: the building is specifically named in the tour description. If you would like to discuss on site where the architect’s vision ends and the history of its construction begins, you can meet Radius Tour Bureau’s Moscow guides. Viewing from the street does not include access to the Centrosoyuz Building’s staff areas.

Sources

1. Le Corbusier Foundation: Centrosoyus, design and construction
2. State Historical and Cultural Expert Assessment of the Centrosoyus Building, 2022
3. Le Corbusier Foundation: Cité de Refuge and the ‘exact breathing’ system
4. State Historical and Cultural Expert Assessment of the Centrosoyus Building, 21 August 2025
5. Jorge Torres Cueco. Le Corbusier, Architecture and Technology: Centrosoyus in Moscow, 1928–1936
6. Ramírez-Balas et al.: a study of the neutralising wall and Saint-Gobain’s tests