Building of the Council of State and Supreme Courts, Government building in Monaco City, Monaco.

The Hôtel du Conseil d'État et des Juridictions suprêmes, an annex of Monaco's Palais de Justice, stands at no. 12 rue Colonel-Bellando-de-Castro in south-western Monaco-Ville. The mid-19th-century building is topped by a terrace enclosed by a balustrade; the Journal de Monaco wrote in 1863 that seen from the sea it looked like a pleasure house. It houses the Council of State and the supreme courts.

The house on this site was sold in 1832 to Abbé Sixte Cauvin, garrison chaplain, who ran a commercial college there that drew pupils from Genoa. Prince Charles III bought it in 1861 for 20,000 francs; the building for the Council of State and its commissions was finished in February 1863, and the governor-general moved in with his offices. Work resumed in spring 1864, and on 1 July 1864 the charity office created by sovereign ordinance of 4 April was installed in one of its rooms.

The building's name recalls its 1863 role as the hôtel of the Conseil d'État and its commissions, with the governor-general's offices installed there. On 1 July 1864 one of its rooms hosted the first meeting of Monaco's bureau de bienfaisance, the charitable office created by Charles III's sovereign ordinance of 4 April 1864.

The building stands at no. 12 rue Colonel-Bellando-de-Castro, in the south-west of Monaco-Ville and the south-east of the principality. It is a working courthouse and administrative seat, so visits are limited to the exterior; the terrace with its balustrade, once compared to a pleasure house seen from the sea, is best viewed from the street.

The site was a private house owned by a man named Vignalis under the First Empire; in 1832 he sold it to Abbé Sixte Cauvin, garrison chaplain of Monaco, who installed a commercial college there that drew pupils from as far as Genoa. Prince Charles III bought the house back in 1861 for 20,000 francs.