On the south side, the old Post Office now serves as the office of the President of Madrid, the head of the regional government of the Autonomous Community of Madrid (not to be confused with the Madrid City Council, which is housed elsewhere). Also on its south side, the square holds a mounted statue of Charles III of Spain, nicknamed "el rey alcalde" ("the mayor-king") due to the extensive public works program he set in motion. The famous Tío Pepe lighted sign was above the square's eastern building between the Calle de Alcalá and the Carrera de San Jerónimo (Apple store today) for a long time, now is on top of the former Paris Hotel.