21. Expropriation is effected by serving on the owner a notice informing it that its property is expropriated.
Where the property of the owner is expropriated in part only, the notice of expropriation shall contain either a summary description of the property not being expropriated or the description of the property being expropriated.
The notice of expropriation is published in the Gazette officielle du Québec.