The trustees, with the consent of the Director of Finance, may sell or trade such of the property belonging to the state and used for the California State Polytechnic University or the California Polytechnic State University as may in the judgment of the trustees be disposed of advantageously. The proceeds of the sale shall be used for the purchase of such other land for the use of the California State Polytechnic University or the California Polytechnic State University as the trustees and the Director of Finance may deem necessary.