A technique of presentation and performance of offer and sale procedures for real estate, using telematic means and inviting the proponent to make an offer, in real-time, based on a reiterated series of irrevocable proposals of purchase and on the preliminary "enabling" or qualification of the purchaser, made possible by : the payment of an enrolment fee, the assignment of a pseudonym and a related secret code, and the receipt of a first irrevocable purchase proposal in written form. The performance of new offers is made by taking account of the classification, during the whole offering period, and by the use of the pseudonym and of the related secret code; wherein, the publication of a proposal at a higher price implies the refusal by the seller, of all proposals at a lesser price. The closing of the market is subject to a previous unlimited postponement, through a possible unlimited time extension, and the publication of the classifications, the immediate refund of the enrolment fee to the entitled persons and the sending of the acceptance proposal to the person that is classed first, provided that, if the proponent who is classed first exercises the right of withdrawal, the acceptance is sent to the proponent that is classed second.