
The Tour Montparnasse, a 210-metre skyscraper that opened in 1973, has long been regarded as an eyesore on the Paris skyline. The tower’s dark tinted-glass exterior and imposing presence in the historic southern district have earned it a reputation as the city’s ugliest building, with visitors to its observation deck famously joking that views improve when the structure itself is obscured.
A decade-long effort to redesign and rehabilitate the building reached a critical juncture this week when its multiple private co-owners—comprising French investment funds and insurance firms—voted on whether to proceed with renovation work. The project was intended to include a complete glass facade replacement, extensive vegetation and landscaping elements including a rooftop agricultural greenhouse, a hotel component spanning three floors, and updated office and leisure facilities. However, the estimated cost of the renovation more than doubled to €800 million when an intensive asbestos removal operation was factored into the plans.
During a final vote on launching the first renovation phase, more than 75 percent of co-owners rejected the project, effectively halting work before a building permit expires at the end of November. The rejection has prompted concerns that the currently vacant and closed building will remain in a deteriorated state, particularly following a summer incident in which pieces of glass dislodged from the structure fell to the street below.
Local and city officials have expressed concern about the project’s collapse. The 15th district’s mayor emphasized the need for consensus, while some co-owners, including businessman Xavier Niel, indicated willingness to explore scaled-down alternatives. Paris’s municipal government stated it seeks a revised proposal to prevent further stagnation at the site. Separately, architect Renzo Piano continues work on a planned redesign of the shopping center beneath the tower, with officials hoping to avoid delays to that component. Some opposition councillors have suggested demolishing the tower entirely and replacing it with a park to provide cooling benefits during heat events.
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