De Rotterdam is a building on the Wilhelmina Pier in Rotterdam, designed by Rem Koolhaas in 1998. The complex is located between the KPN Tower and Rotterdam Cruise Terminal and was finalized at the end of 2013. On 21 November 2013, the municipality of Rotterdam, as the largest user, received the keys. The design provides space for offices, a hotel and apartments. The 44 floors amount to a total area of approximately 160 000 m², allegedly making it the largest building in Europe.
Wikipedia link: http://en.wikipedia.org/wiki/De_Rotterdam