Rising at the edge of Paris’s historic skyline, Tour Triangle marks one of the city’s most significant departures from its long-standing resistance to height. Located at Porte de Versailles in the 15th arrondissement, the project is designed by Herzog & de Meuron and developed by Unibail-Rodamco-Westfield, with construction progressing throughout 2025 and completion scheduled for 2026.

At approximately 180 metres in height, Tour Triangle will become the tallest building constructed within Paris proper since Tour Montparnasse. Its defining feature is its pyramid-like, trapezoidal geometry, a form developed to reduce perceived bulk, limit shadow impact on surrounding neighbourhoods, and respond to strict urban and environmental constraints.

The building is conceived as a mixed-use vertical complex, combining office spaces, a hotel, retail functions, public amenities, and upper-level observation and hospitality areas. Rather than operating as a closed corporate tower, Tour Triangle is positioned as an extension of the adjacent exhibition grounds, reinforcing permeability and public access at ground and podium levels.

From a façade and envelope perspective, the project is defined by its fully glazed exterior, articulated through a carefully engineered glass geometry that changes orientation depending on elevation and exposure. The façade strategy relies on a high-performance glazed envelope, designed to balance transparency with solar control and energy efficiency. The inclined planes of the building allow each façade orientation to be optimised individually, reducing glare and overheating while maintaining visual lightness.

Environmental performance has played a central role in the project’s approval and execution. Tour Triangle is targeting HQE Exceptional and BREEAM Outstanding certifications, integrating energy-efficient glazing, controlled solar gain, and low-carbon construction strategies. The building also incorporates renewable energy systems and advanced building management technologies to reduce operational impact.

Construction is being carried out by BESIX, with the structural concrete works advancing steadily during 2024–2025. Despite prolonged political debate and legal challenges over more than a decade, the project is now firmly embedded in Paris’s urban transformation narrative.

Tour Triangle does not attempt to replicate the skyline logic of La Défense. Instead, it introduces a measured, façade-driven vertical expression, using glass and geometry to negotiate between density, transparency, and the visual sensitivity of Paris’s urban fabric. For the European façade and glazing industry, it represents a rare case study of high-rise envelope design within one of the continent’s most tightly regulated capitals.