A Power of Attorney is a document that lets you appoint someone to represent you. If you sign a Power of Attorney, you are the principal.The person holding your Power of Attorney is known as your Attorney in Fact. They have a fiduciary responsibility to act in your best interest. Creating a valid POA in California requires meeting legal criteria such as age, competency, specifying powers, and proper execution. The process of using a Power of Attorney in a real estate transaction begins with drafting the POA document. When you give someone a "Power of Attorney" (POA) you are giving them "agency authority:" the power to act in your name. Even with a durable POA, your authority to sell property rests on it being expressly stated within the document's language. For the most part, a power of attorney can involve managing finances or selling property like cars and homes for another person. Fresno Regional Office.