Tenants in Washington must obtain explicit written consent from their landlord before subleasing a rental property. Create your Washington sublease agreement and sublet your rental.Rent your unit to a subtenant with our attorney-approved template. Washington Sublease Agreement. A Washington sublease agreement is a contract used when a tenant wants to rent part or all of their residence to another person. Search available sublease spaces in Seattle Metropolitan Area, WA, USA. View property photos, floorplans, pricing details and more. How the State Acquires Leased Space. Real Estate Services acquires lease space from the private sector for all state agencies, boards, and commissions. Here is a sample sublease agreement you can fill out or use as a template.