Note 186 — CHAPTER 8 SECOND EMPIRE PARIS, UNITED ITALY, AND IMPERIAL-AND-ROYAL VIENNA

The degree of control exercised by public authority over the façades varied. For the extension of the Rue de Rivoli, continuation of Percier & Fontaine’s original design was required; and for the Place de l’Étoile and the Place de l’Opéra comprehensive designs established in advance were enforced (see below). Elsewhere only the height of the cornice line and the silhouette of the mansard were ordinarily standardized by regulation.