These twin skyscrapers, located in the Plaza de Colón, were built by architect Antonio Lamela in 1976, using a different approach and commencing construction with the highest floors. The towers were built around a central concrete skeleton anchored to the ground, and each of the 23 floors of these two buildings were then 'hung' onto it. Together these two high-rises, which stand 116 metres tall, comprise Madrid’s eleventh highest building.

In the early 1990s they were renovated, and the two buildings were joined together by a fire escape ladder that hangs from a green structure which crowns the building and is shaped like a plug.

From 2020 to 2023, these towers are undergoing a full refurbishment directed by Luis Vidal + arquitectos: the plug-shaped roof has been removed, as has the orange cladding. Four floors will be added to replace the plug, and the fire escape will be extended so that it reaches each floor of the building.