A lease addendum is a section added to an existing lease. The addendum is used to clarify the details contained within the contract, and may contain additions to the existing lease. A landlord may hold a contract with a tenant who decided to get a pet. The landlord therefore may add an addendum with details explaining the pet fee, and any stipulations on the pet allowed on the landlord's premises.
The addendum serves to specify the terms and conditions of the lease between the two parties. The existing lease still stands, and the addendum only defines or adds to the existing lease. Lease addendum may contain language regarding repairs, maintenance, parking permits, pets and other issues that may arise in the landlord-tenant relationship.
If a residence has more than 2 tenants mentioned on a lease, a lease addendum can be used to release a tenant from the lease. The document would also certify the remaining tenant will fill the rights and obligations of the original lease.