Il faut au préalable s'assurer qu'un congé est délivré dans les formes et les délais requis par la loi. Si malgré cela le locataire ne veut pas quitter les lieux, il n'y a pas d'autre option que de saisir le tribunal en vue d'une expulsion

Parting is such sweet sorrow. The immediate task at hand is to assess the legal position of the parties,refresh your options , remedies and security as well as the tenant’s restoration obligations to have proper awareness of the legal landscape. It would then be important to understand the motivations behind the tenant’s refusal to leave and determine if an overhold is required to accommodate the leasehold improvements required in the tenant’s new space or any other circumstances. Once the legal advice and context is gathered,it would be important to move expeditiously to avoid creating any acquiescence and estoppel defences. If the tenant continues to overstay their welcome,then legal action is the only remaining option.