Puerto Rico Ilustrado/El Mundo Building is a historic Art Deco high-rise building located in the Old San Juan historic district of the city of San Juan, Puerto Rico. The building was erected in 1923 to serve as the headquarters of the El Mundo newspaper and the Puerto Rico Ilustrado magazine. The architecture of the building blends numerous styles that represent the conjunction of various artistic movements and architectural schools of the late 19th century and the early 20th century. It is located in a high-rise block that faces the elevated La Palma Bastion portion of the city wall of San Juan which, when observed from beyond, makes the building look taller than it is in reality. The building was added to the National Register of Historic Places in 1997 for its architectural and historic importance.