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CSN Head Office Expansion

Construction management for the expansion of the Confederation of National Trade Unions (CSN) head office. The project was carried out in two phases: the redevelopment of the existing 100,100 sq. ft. building and the construction of a new 121,000 sq. ft. building, that includes offices, conference rooms, an atrium, a cafeteria, common areas, a bookstore and a library. The project includes demolition and repair work in the areas occupied by the client, the addition of a new 1,600-amp electrical entrance in the existing building, the construction of a five-level underground parking lot, the landscaping, composed mainly of native plants, an integrated delivery area, as well as the complete redevelopment of the electromechanical systems, to ensure the proper functioning of the two buildings.

  • LEED® Silver certified project, 2019.


  • Activity Sector Commercial
  • Client CSN
  • Year 2014-2017
  • Value $39,400,000
  • Engineers Roche Ingénieurs-conseils / Ingémel
  • Architect BGLA Architecture