To dispossess of ownership. It is supposed to be a procedure based on social or public interest. The State coercively acquires properties, rights, or patrimonial interests, for itself or for a third party.

This type of procedure entails a number of elements that must be accomplished, or else they suppose the nullity of the process.

Such elements are:

• Declaration of the social and public interest.
• Valuation: total to be paid to the expropriated party.
• Reversion right: the expropriated party will have the right to have the good returned if the cause of public utility disappears.