1460B. If the thing sold is an immovable and if, within the delay of article 1460A, the seller satisfies, to the extent of seventy-five per cent. or more, the obligations mentioned in article 1456, he or she likewise takes back the thing, but burdened, from the date of the sale with right of redemption, with a hypothec in favour of the buyer guaranteeing the payment of the balance of such obligation, which is converted into a claim of the buyer against the seller.