A lease addendum is a legal document that allows the landlord to make changes to the original lease agreement. Get your free lease addendum!Occupant leaves the Leased Premises permanently before the end of this Occupancy. Agreement without Landlord's permission, except as permitted in the Addendum. A lease addendum allows you to add an additional document to or adjust the terms of your existing rental agreement. TENANT understands and agrees that the LANDLORD is not responsible for completing turnover work earlier than the move-in date (i.e. Pro Tip: Don't risk ending up with bad Tenants. A lease addendum is a separate legal document that allows a landlord to add additional information or make changes to a lease agreement. Tenant must deliver Apartment to Landlord on or before the cancellation date in the notice and pay all rent due to the date of the fire or casualty. Access state-specific templates that can be customized with Unlimited Plus.