Twin skyscraper office buildings known as Kio Towers financial district, also named as Four Towers Business Area, in Madrid, Spain

kio towers gate of europe towers madrid skyscrapers madrid financial district madrid skyline madrid business district ctba spain skyscrapers spain architecture spain modern architecture spain capital madrids financial district madrids cuatro torres spanish economy spanish architecture industry spanish housing industry series calle castellana castellana street aerial skyline view highrise buildings skyscraper apartments crowded living condition living condition income disparity real estate sector development engineering prosperity housing crisis apartment crowded living conditions crowded buildings global economy world recession highrise apartments apartment mortgage aerial view apartment bubble finance aerial city view real estate spains real estate tower buildings highrise twin office buildings torres kio plaza de castilla