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That ends with the final contract when both parts sign in front of a notary (- If you are planning to buy land to build a house, you should consider that any plot classed as rustic or agricultural land (terreno agricolo) has restricted building and will cost much less than urban plots.
I have just finished the first part dealing with the Nehru years and am surprised by what I've read.
Nehru and Patel and his cabinet had a huge fight with the Judiciary over the Government's right to restrict property rights (redistributing Zamindar lands etc) and also many speech rights.
Then you can make an offer, if your offer is accepted, you and the seller sign a preliminary sales contract, and you make a downpayment to secure the property.
At this point if the seller backs down, he has to pay you double the deposit, if you back down you lose the deposit unless there's a legal reason to justify that.