Authority of agent to sell piece of land or interest thereon VOID if not in writing

When the sale of a piece of land or any interest thereon is through an agent, the authority of the latter shall be in writing otherwise, the sale shall be void. Thus the authority of an agent to execute a contract for the sale of real estate must be conferred in writing and must give him specific authority, either to conduct the general business of the principal or to execute a binding contract containing terms and conditions which are in the contract he did not execute. A special power of attorney is necessary to enter into any contract by which the ownership of an immovable is transmitted or acquired either gratuitously or for a valuable consideration. The express mandate required by law to enable an appointee of an agency (couched) in general terms to sell must be one that expressly mentions a sale or that includes a sale as a necessary ingredient of the act mentioned. For the principal to confer the right upon an agent to sell real estate, a power of attorney must so express the powers of the agent in clear and unmistakable language. When there is any reasonable doubt that the language so used conveys such power, no such construction shall be given the document. [G.R. No. 114311. November 29, 1996]