The case for marijuana is no different. Original Lease or Rental Agreement: refer to the existing agreement which was created between Landlord and Tenant. The date and name of the Lease or Rental Agreement should be clearly stated. Unlike a lease amendment, which is a change in the contract itself, a lease addendum is an additional document that is added to the existing lease agreement. For example, in the residential lease context, pet ownership, roommate expectations, crime free agreements, and lawn care policies may all be controlled by addenda (if they are not already controlled by the lease itself). Where there may be a problem, there is usually a solution and this is it. Use this Smoke-Free Property Addendum to attach to your leases to make your precious investment safe from the physical hazards of smoke.