French term (edited): arr�t� de p�ril

See Dangerous building ordinance or order

can also be "structure" depending on context
Dangerous Structure Order

Section 77 of the Building Act 1984 enables local authorities to apply to a Magistrate's Court for an order requiring the owner to make a building safe, or to demolish it. If the owner fails to comply, the local authority can carry out the works and reclaim the expenses which are then registerable as a local land charge.

Works under a Dangerous Structures Order are subject to listed building controls and consent may be required.

Voir la législation - différence entre péril imminent (imminentdanger) et péril ordinaire
http://www.logement.gouv.fr/actu/habitatindigne/appui_method...

The regulations (règlements) are called a décret (if taken by the President or the Prime Minister) (autonome or d'application), arrêté (ministériel, préfectoral or municipal) (if taken by a minister, a prefect or a mayor), or circulaire (no force of law but can be reviewed by administrative courts).