The authorized agent must bring the power of attorney document and the new deed to the real estate closing. While Massachusetts law does not technically require a POA to be notarized, signing your POA in the presence of a notary public is very strongly recommended.A real estate power of attorney is an essential legal document that provides authority to someone else to make decisions on your behalf. A power of attorney document allows someone that you select (your "attorney-in-fact" or "agent") to act on your behalf in financial matters. My question is- can I complete a power of attorney with my wife so she can sign on my behalf for both a buyer and seller closing? Stepbystep instructions about how to sign a deed to transfer real estate using a power of attorney. A Massachusetts real estate power of attorney is a legal document used to authorize an agent to handle real estate matters on behalf of a principal. In Massachusetts, sellers are required to draft the deed that transfers ownership from seller to buyer. A power of attorney document allows someone that you select (your "attorney-in-fact" or "agent") to act on your behalf in financial matters. Our firm prepares the deed for local real estate transactions.