In Western Australia, this standard residential tenancy agreement form should be used for agreements between: In Western Australia, a residential rental agreement can be written or oral. Whether the agreement is written or oral, the standard terms established by the Government of Western Australia apply. A landlord must provide all tenants with written disclosure of all known mold contaminations in the rental unit, as well as educational information from the Washington State Department of Health on how to control mold and the potential health risks that come with it. (RCW § 59.18.060) Tenants and landlords can agree that in addition to the standard terms, additional terms apply to the contract. These should be included in the housing rental agreement.