81.6. he Minister may acquire by preference over any other purchaser, at the price of the written offer or, as the case may be, that of the adjudication, any parcel of designated territory. To exercise that right of pre-emption, the Minister must notify in writing the person offering it for sale of his intention to acquire all or a parcel of that territory not more than sixty days after the expiry of the delay provided in section 81.5.