Washington Power of Attorney — Sale is a legal document used in the State of Washington to grant another person the authority to act as an individual's agent in the sale of real estate property. It is a written document that grants someone else the power to represent the individual in the sale of the real estate and to sign documents on their behalf. The types of Washington Power of Attorney — Sale include General Power of Attorney, Special Power of Attorney, Durable Power of Attorney, and Limited Power of Attorney. The document must contain specific language to be legally binding in the State of Washington. It must include the date of signing, the names of the principal and the agent, and a description of the real estate property being sold. Furthermore, the document must be signed and notarized in order to be valid.