La Unión y el Fénix Español building - Credit: Wikimedia Commons
The La Unión y el Fénix Español building, destined to be the headquarters of the former insurance company "La Unión y el Fénix Español", was one of the first skyscrapers in Madrid. Since 2006 it has housed the "Petit Palace Alcalá Torre" hotel, which belongs to a hi-tech company. Read more on Wikipedia
Source: en.wikipedia.org