concept that is defined by the Office for Metropolitan Architecture as a vertical city. De Rotterdam will be used daily by about 5,000 people and with a floor space index of 32 De Rotterdam forms the most densely built part of the Netherlands. References External links Website De Rotterdam Office buildings completed in 2013 Skyscrapers in Rotterdam Postmodern architecture Rem Koolhaas buildings Skyscraper office buildings in the Netherlands Residential skyscrapers in the Netherlands Skyscraper hotels in the Netherlands