A tenant renting a residence may not assign his lease without the written consent of the owner, which consent may be unconditionally withheld without cause. Landlord is not a party to the assignment and executes this document for the limited purpose of granting its consent.Assigning or underletting without consent, where that consent is required, is a breach which (on usual lease terms) gives rise to a right to forfeit the lease. The form typically states that there can be no assignment or subletting without the landlord's prior written consent. The landlord may want to use the consent as an opportunity to extract a fee or other benefit from the tenant. Assignment and Subletting. Is the landlord's consent required to the assignment? "And if the landlord reasonably refuses to consent—and it is often unclear what that looks like—the tenant cannot proceed with the subletting. Often, written leases prohibit the tenant from subletting the premises without the written consent of the landlord. Out to be agents or employees of Landlord.