Pedro Benoit (February 18, 1836 – April 4, 1897) was an Argentine architect, engineer, and urbanist best known for designing the layout of
La Plata
La Plata () is the capital city of Buenos Aires province, Argentina. According to the 2022 Argentina census, census, the La Plata Partido, Partido has a population of 772,618 and its metropolitan area, the Greater La Plata, has 938,287 inhabit ...
City.
Life and times
Pedro Benoit was born in
Buenos Aires
Buenos Aires, controlled by the government of the Autonomous City of Buenos Aires, is the Capital city, capital and largest city of Argentina. It is located on the southwest of the Río de la Plata. Buenos Aires is classified as an Alpha− glob ...
in 1836 to María Josefa de las Mercedes Leyes and ', a
French émigré who had left his homeland following the
Bourbon Restoration. His father, a trained
architect
An architect is a person who plans, designs, and oversees the construction of buildings. To practice architecture means to provide services in connection with the design of buildings and the space within the site surrounding the buildings that h ...
,
engineer
Engineers, as practitioners of engineering, are professionals who Invention, invent, design, build, maintain and test machines, complex systems, structures, gadgets and materials. They aim to fulfill functional objectives and requirements while ...
and
topographer instilled his interests in his son, who enrolled in 1850 at the Topography and
Geodesics School of the Department of Engineering of the
Province of Buenos Aires
Buenos Aires, officially the Buenos Aires Province, is the largest and most populous Provinces of Argentina, Argentine province. It takes its name from the city of Buenos Aires, the capital of the country, which used to be part of the province an ...
.
Gaining his first professional experience designing
pontoon bridges for the
Argentine Army, Benoit was contracted as a
surveyor for the city of Buenos Aires. In this capacity, in 1858 he planned the first road to
Ensenada, a harbor town 35 miles (56 km) south of Buenos Aires. The young surveyor was inducted into a local
Freemason lodge in 1858 and the following year, he was commissioned by prominent local landowner Juan Dillon to design the urban layout for what became
Merlo (a suburb west of Buenos Aires).
Benoit designed Merlo following patterns similar to those used by
Pierre L'Enfant to design
Washington, DC
Washington, D.C., formally the District of Columbia and commonly known as Washington or D.C., is the capital city and Federal district of the United States, federal district of the United States. The city is on the Potomac River, across from ...
. Benoit relocated to the city he helped build, designing for it the first school and the Church of Our Lady of Mercy in 1863, still the city's central
Roman Catholic
The Catholic Church (), also known as the Roman Catholic Church, is the largest Christian church, with 1.27 to 1.41 billion baptized Catholics worldwide as of 2025. It is among the world's oldest and largest international institut ...
church; Benoit's professed Freemasonry caused the
Bishop of Buenos Aires, Monsignor Mariano Escalada, to deny the new parish a priest, however.

Benoit continued his duties as Director of the Department of Topography, planning the rectification of the
Riachuelo River flowing south of Buenos Aires, then prone to flooding. His diverse training allowed Benoit an appointment to Merlo's Committee on Public Health in 1867, when he designed the Santa Isabel Cemetery. Remaining at the Topography Department, he plotted a
tram
A tram (also known as a streetcar or trolley in Canada and the United States) is an urban rail transit in which Rolling stock, vehicles, whether individual railcars or multiple-unit trains, run on tramway tracks on urban public streets; some ...
way line between
Ensenada and Tolosa, two small cities southeast of Buenos Aires. A prominent
Spanish Argentine landowner, Manuel Rodríguez Fragio, commissioned Benoit in 1872 to design the master plan for another new city,
Ituzaingó (not far from Merlo), and towards 1880, Benoit returned to Buenos Aires to help design the new
rampart
Rampart may refer to:
* Rampart (fortification), a defensive wall or bank around a castle, fort or settlement
Rampart may also refer to:
* LAPD Rampart Division, a division of the Los Angeles Police Department
** Rampart scandal, a blanket ter ...
s for what would later become
Puerto Madero
Puerto Madero, also known within the urban planning community as the Puerto Madero Waterfront, is a Barrios and Communes of Buenos Aires, ''barrio'' of Buenos Aires in the Buenos Aires Central Business District, Central Business District. Occup ...
. These efforts earned him the honor of Lieutenant Colonel of the Argentine Corps of Engineers.
[
]
La Plata
Ongoing resentment over the apportionment of rapidly growing customs duties from the main port led to a failed insurrection in the Province of Buenos Aires against the newly elected administration of President Julio Roca in 1880. The province's voters, however, elected a candidate in 1881 who, despite his disadvantage in belonging to Roca's PAN, articulated a message of political integration with the suddenly prosperous Argentina: Dardo Rocha. Facing ongoing secessionist pressures from his constituency, Governor Rocha proposed the creation of a new provincial capital in replacement of the city of Buenos Aires, which was federalized as the nation's capital in 1880. The proposal, useful to the mollification of the province's Independence-leaning gentry, was quickly approved by Congress.[
Governor Rocha commissioned Benoit to plan the new city, which became the renowned urbanist's most ambitious project. Named '']La Plata
La Plata () is the capital city of Buenos Aires province, Argentina. According to the 2022 Argentina census, census, the La Plata Partido, Partido has a population of 772,618 and its metropolitan area, the Greater La Plata, has 938,287 inhabit ...
'' after its mention in José Hernández's epic '' Martín Fierro'', the city was planned by Benoit in a regular pattern of diagonals and precisely-placed squares.
Benoit chose to echo the design of Buenos Aires in his plan for La Plata, particularly in his use of diagonals, small squares, and architectural styles. Some technical details, such as the cemetery location at the far end of a road that begins at the Río de la Plata, have been noted as containing deep symbolism for life beginning in the water and ending in the east.
Benoit, as technical director of the urbanist project, designed most of the early public buildings in La Plata, as well. His designs for the La Plata Observatory, Economy Ministry, Police Headquarters, Engineering Department and Governors' Offices were completed shortly after the city's November 19, 1882, christening. Giving the city its first house of worship, the Church of Saint Pontian, Benoit designed the Cathedral of La Plata
The Cathedral of La Plata in La Plata, Argentina, dedicated to the Immaculate Conception, is the 58th List of tallest churches in the world, tallest church in the world. This Neogothic edifice is located in the geographical center of the city, f ...
with Ernesto Meyer (the architect of the German Renaissance revivalist City Hall) in 1884. The Neogothic cathedral, the second-largest of its kind in the world, was only completed in 1999. He also designed La Plata Cemetery (established 1886). The tireless urbanist was also commissioned to design master plans for Quilmes
Quilmes () is a city on the coast of the Rio de la Plata, in the , on the southeast end of the Greater Buenos Aires, being some away from the urban centre area of Buenos Aires. The city was founded in 1666 and is the seat of the eponymous '' ...
, San Pedro and Mercedes, all important cities in the Province of Buenos Aires.
His master plan for the city earned Benoit two gold medals at the 1889 Paris Universal Exposition, where it was honored as the "City of the Future." Benoit was elected to the La Plata City Council the following year, during which he designed his city's great seal, and as Mayor in 1893. Keeping a busy schedule, he also accepted a post as the Director of the Provincial Mortgage Bank and as the first Dean of the School of Engineering in the newly created University of La Plata, in 1897.
The strain proved too much for Benoit, however, who died suddenly that year, at age 61. He is buried in La Recoleta Cemetery.
References
External links
{{DEFAULTSORT:Benoit, Pedro
1836 births
1897 deaths
People from Buenos Aires
Argentine people of French descent
Argentine Freemasons
Argentine architects
Argentine civil engineers
Argentine urban planners
Mayors of La Plata
Academic staff of the National University of La Plata
Burials at La Recoleta Cemetery
19th-century Argentine architects