Palacio de Cibeles

One of the two side entrance halls.
The Palacio de Cibeles (“Palace of Cibeles”, built in 1919) has been the seat of Madrid City Council since 2007. It is named after the Plaza de Cibeles, where it is located. It was previously known as the Palacio de Comunicaciones (“Palace of Communications”) and was the main post office building in the Spanish capital.
The palace, which covers an area of around 12,200 m², was built on the Plaza de Cibeles in the center of Madrid. The 30,000 m² plot had previously belonged to the north-western part of the Jardines del Buen Retiro gardens.
Construction planning began in 1904 under the project management of architects Antonio Palacios, Julián Otamendi and civil engineer Ángel Chueca Sainz. The design incorporates various historical architectural styles, making it a typical example of eclecticism. The total budget at the time amounted to 10,311,860 pesetas. The foundation stone was laid in 1907. On March 14, 1919, the official inauguration took place under the name Catedral de las Comunicaciones and the start of operations as the main post office, distribution center and museum for post, telegraphy and telephone by the Spanish royal couple Alfonso XIII and Victoria Eugénie.
After several renovations, the Palace of Communications became the headquarters of Madrid City Council on November 5, 2007. The Spanish postal service now only uses the south wing of the building.
Quote: Wikipedia