A Colorado sublease agreement is a rental contract that establishes the rights and obligations of a subtenant renting property from a tenant. This agreement is separate from the original residential lease agreement, but it cannot interfere with the provisions of the lease in any way. Colorado’s Landlord and Tenants Rights guide states that subleasing is allowed in the state but only with the landlord’s permission, which should be obtained in writing to protect all parties. Furthermore, landlords may not unreasonably withhold consent if the lease agreement does not contain provisions related to subleasing.