Sébastien Sehili-FranceschiniConsultant

Avocat au Barreau de Paris, Sébastien Sehili-Franceschini joined CastaldiPartners in 2023.


Sébastien Sehili-Franceschini specialises in public law, property law and environmental law. His expertise covers all legal aspects relating to administrative authorisations, economic relations between private companies and public authorities, and transactions or construction projects involving real estate assets or infrastructure. He also handles litigation in the same areas of expertise.

Sébastien Sehili-Franceschini advises a wide range of clients, both private (property developers, investors, users, renewable energy developers) and public (local authorities, semi-public companies, public bodies). His working languages are French, English and Italian.

Representative Matters

  • Audit assignment carried out on behalf of a State concerning the proper use of subsidies granted in the field of research.
  • Advising the municipality of an international ski resort on the renewal of its public service delegation contract for the management of the ski area.
  • Assisting a materials extraction group in defending its environmental permit for the construction of a new extraction quarry.
  • Defending a company awarded a public supply contract in an appeal brought by an unsuccessful candidate.
  • Assistance to a company subject to expropriation proceedings in contesting the public use of the project and the amount of expropriation compensation awarded.
  • Assistance to a group with the sale of a hotel asset.
  • Regular support to companies against the authorities in connection with the refusal of administrative authorisations.

Speaking Engagements

  • Formations pour l’Association des Maires de la Somme (2015 à 2019).  
  • La réforme du droit des marchés publics (Formation Fédération SCOP BTP, Décembre 2015).
  • Actualité de la réglementation administrative des entreprises des secteurs secondaires et tertiaires (Formation Sud Oise Développement, Octobre 2015).
  • Actualité de droit forestier (Formation Office national des Forêts, Août 2015).
  • Réglementation administrative des nouvelles technologies (Colloque CCI de l’Oise, Avril 2015).


  • Rédaction d’un article relatif aux Délégations de service public en station de ski (Article Café des Sports 2019).  
  • La loi ALUR (Article de la Revue des Maires d’Ile de France, Juillet 2015).


  • Paris I Sorbonne IAE
  • Paris XI Jean Monnet
Sébastien Sehili-FranceschiniConsultant
+33 (0)6 7488 8987