Edificio Mercosur, Greek Revival headquarters in Montevideo, Uruguay

The Edificio Mercosur, also known as the Palacio del Mercosur or Parque Hotel, is an eclectic building with French influences on the Rambla de Montevideo, facing Playa Ramírez beside Parque Rodó. Its public rooms, dining hall, gaming rooms and ballroom occupied the ground floor, with guest rooms above arranged for ventilation and outward views. The former ballroom now serves as the plenary hall of the Mercosur Parliament.

Authorized in 1906 for the Luis Crodara company, the building opened on 30 December 1909 as the Hotel-Teatro-Casino del Parque Urbano, designed by French architect Pierre Lorenzi with Guillermo West. Montevideo's municipality bought it in 1915. Extensions by Juan Antonio Scasso followed in 1938 and another in 1960; it was declared a National Historic Monument in 1975. The hotel closed in 1997 and the building passed to the Foreign Ministry for Mercosur's administrative headquarters.

The former hotel ballroom now serves as the plenary chamber of the Mercosur Parliament, while guest rooms became offices and meeting rooms. The building also hosts offices of international bodies such as the OAS, UNESCO and IFAD, and since 1997 has been the administrative seat of Mercosur.

The building stands on the Rambla de Montevideo by Playa Ramírez, next to Parque José Enrique Rodó in the Parque Rodó neighbourhood. It is an institutional and diplomatic seat, so access is not that of a public museum; visits are arranged with the institution in advance. The former ballroom now serves as the plenary hall of the Mercosur Parliament.

Mexican poet Amado Nervo died on 24 May 1919 in room 42 of the hotel, not 1926. The room number and date are the detail to look for; the building later became the administrative seat of Mercosur and its former ballroom now serves as the plenary hall of the Mercosur Parliament.