Celebrations

Manifestations of the Barranca in Buenos Aires Architecture

Buenos Aires is a coastal city bordered by a river without visible shores. Unlike other metropolises, where the presence of a river becomes an urban situation incorporated into the landscape—whether as a promenade, a waterfront, or a natural boundary between districts—the layout and fabric of Buenos Aires almost ignore the barranca (the natural riverbank escarpment) where the city once ended. Today, that barranca survives as a faint, nearly imperceptible trace, appearing only intermittently in the irregular topography of certain areas.

This environmental condition—an undulating pampa, later anthropized under the ideal of a perfectly flat grid—translated in various ways into architectural projects that happened to be—or were condemned to be—built on sloped parcels. When observing how sidewalks meet building façades, the most common response is simply to accept the difference in level: projects designed without topographical consideration, treating the slope as a residual condition and then absorbing it through a stretch or extension of one side of the building to compensate for the height variation. It is a timid response which, in merely acknowledging the slope, ends up quietly accompanying it.

A less fortunate attitude—yet also common across several sites in the city—is denial. Buildings designed as if no change in elevation existed. The strategy is straightforward: a reference point is chosen from which to design the façade, the entrance is placed, and from there the composition unfolds. Below that point, a blank and opaque frontage is produced: a mute retaining wall becomes the façade at street level. Whether through dogma or lack of skill, in attempting to avoid the barranca, these buildings ultimately highlight it.

Celebrations explores those projects that recognized this ancestral yet often ignored territorial condition as an opportunity. Architectures that made use of the irregularity of the ground to produce either eloquent or subtle gestures: semi-buried spaces, sloped entrances, or landscape interventions. Projects that resolve the presence of the barranca with pragmatic elegance or spatial skill. The celebratory attitude demonstrates not only technical proficiency, but also inventiveness in exploring the potential of an atypical parcel.

In some cases, where the slope is slight, a well-designed entrance is enough (the towers of Barrancas de Belgrano, with their planted terraces and stepped access, are an example).

When the height difference reaches one or two meters across a single ground level, other strategies emerge. The most common is the use of a plinth: a solid base that absorbs the grade and frames the ground floor (Comega, Kavanagh). Less common—but also present—is another group of projects that turn to the open ground floor as a way to accommodate the slope, employing columns of varying lengths (Edificio Estuario, Paseo Arroyo). An elegant way of using void as a spatial mediator.

Four cases are presented—both canonical and anonymous—that celebrate the presence of the barranca.

Comega

At the groundplan the strategy for containing the barranca in the Edificio Comega is based on organizing the ground floor into three bays that subdivide the slope. Each bay has its own zero level and therefore its own entrance, even though all spaces belong to the same ground floor.
On the façade, the strategy is resolved through a subtle, almost pictorial operation: the solid base—made of the same stone panels as the rest of the building—absorbs the variations in level and the columns of the arcade until the condition becomes normalized. From that point on, in a slightly lighter tone, the volumetric development of the skyscraper begins.

The Edificio Arroyo, built in the 1970s as a freestanding tower, sits on a corner with a double slope. The project takes advantage of the barranca running along the long side of the site (twelve meters at its highest point, eight at its lowest) to raise a mezzanine level where the residential entrance is located. This maneuver makes it possible to partially bury part of the building and create a commercial gallery that gradually opens toward the sidewalk as the slope descends.

The gallery—named Paseo Arroyo—benefits directly from this celebratory approach: being semi-buried allows it to go largely unnoticed, while its elongated layout opens along the street, achieving natural light and ventilation that are unusual for a space of this type.

Paseo Arroyo

The Edificio Arroyo, built in the 1970s as a freestanding tower, sits on a corner with a double slope. The project takes advantage of the barranca running along the long side of the site (twelve meters at its highest point, eight at its lowest) to raise a mezzanine level where the residential entrance is located. This maneuver makes it possible to partially bury part of the building and create a commercial gallery that gradually opens toward the sidewalk as the slope descends.
The gallery—named as Paseo Arroyo—benefits directly from this celebratory approach: being semi-buried allows it to go largely unnoticed, while its elongated layout opens along the street, achieving natural light and ventilation that are unusual for a space of this type.

The Bolsa de Comercio, designed by Mario Roberto Álvarez y Asociados and located next to the Comega, does not immediately appear to be a building shaped by the barranca. Nor is it, to be fair, an especially expressive celebration of it. Both its façade on Alem and on 25 de Mayo seem to respond to a condition of apparent regularity. However, there is a six–meter height difference between them.

The true manifestation of the barranca happens inside: it is in section where the celebratory gesture becomes clear. At the point where the two ground floors must meet, a spatial unfolding appears: a suspended mezzanine and a set of escalators—then a technological novelty, also present in Galerías Jardín—provide pedestrian continuity across stratified spaces without sacrificing views or the sense of promenade.

Bolsa de Comercio

The Bolsa de Comercio, designed by Mario Roberto Álvarez y Asociados and located next to the Comega, does not immediately appear to be a building shaped by the barranca. Nor is it, to be fair, an especially expressive celebration of it. Both its façade on Alem and on 25 de Mayo seem to respond to a condition of apparent regularity. However, there is a six–meter height difference between them.
The true manifestation of the barranca happens inside: it is in section where the celebratory gesture becomes clear. At the point where the two ground floors must meet, a spatial unfolding appears: a suspended mezzanine and a set of escalators—then a technological novelty, also present in Galerías Jardín—provide pedestrian continuity across stratified spaces without sacrificing views or the sense of promenade.

The Edificio Agüero, of unknown authorship, is located in the Recoleta “island,” on a lot with a double slope similar to the Edificio Arroyo. The project employs a solid base that takes the full footprint, allowing for a pedestrian entrance on Agüero and a vehicle entrance on Guido. The celebratory gesture lies both in the presence of these dual access points and in the shape of the articulating element, which produces a kind of corner–building, with balconies and planted terraces that accompany the urban topography. This operation aligns with the monumental staircase designed in the early twentieth century by Joseph-Antoine Bouvard, then director of Parks and Promenades of Paris. Completing the singularity of the ensemble, the scene can be observed from the elevated ground floor of the Biblioteca Nacional Mariano Moreno.

Edificio Agüero

The Edificio Agüero, of unknown authorship, is located in the Recoleta “island,” on a lot with a double slope similar to the Edificio Arroyo. The project employs a solid base that takes the full footprint, allowing for a pedestrian entrance on Agüero and a vehicle entrance on Guido. The celebratory gesture lies both in the presence of these dual access points and in the shape of the articulating element, which produces a kind of corner–building, with balconies and planted terraces that accompany the urban topography. This operation aligns with the monumental staircase designed in the early twentieth century by Joseph-Antoine Bouvard, then director of Parks and Promenades of Paris. Completing the singularity of the ensemble, the scene can be observed from the elevated ground floor of the Clorindo Testa´s Biblioteca Nacional Mariano Moreno.