Subleasing. The family may not sublease or sublet the unit. Watch Out for Housing Assistance Scams!• Don't pay money to have someone fill out housing assistance application and recertification forms for you. A sublet, or sublease agreement, adds someone new to an existing lease. To schedule this yourself, use the contact information below. Comprehensive guide to California landlordtenant law. Learn key rules, rights, and responsibilities for landlords and tenants. A California sublease agreement is a written arrangement that involves a residential tenant leasing their rental property to a subtenant. Subleases can arise for many reasonsfor example, when a lessee no longer requires leased space and subleases the excess to another party. Official Forms for Viewing and Downloading.