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Marie Sizun has extensive experience in the real estate and urban renewal sectors, currently serving as Directrice Déléguée des Yvelines at Seqens since October 2019, where responsibilities include the management and maintenance of a portfolio of 15,000 homes and team leadership of approximately 170 personnel. Previous positions include Directrice de la stratégie du Patrimoine at 1001 Vies Habitat, where Marie Sizun managed a team to define and oversee strategic investments in heritage. Prior roles at Groupe Logement Français involved leadership in urban renewal projects and strategic planning across multiple operational areas. Early career experience includes technical studies at OPAC DE PARIS. Marie Sizun holds an engineering degree in Aménagement from INSA Lyon, obtained in 2004.