When a landlord receives a notice of lease assignment from their tenant, their basic right is to conduct a financial and behavioral investigation of the applicant in order to make an informed decision to accept or refuse the applicant.Over the years, the Administrative Housing Tribunal has clarified and established the valid reasons for accepting or refusing candidates.The grounds for refusal must be serious.More recently, the Court explains to us that, without requiring a specific document, the owner has the right to ask the candidate for recent proof of his income and that he has the financial capacity to assume the various obligations (rent and electricity, internet, insurance for instance) related to the lease.