51N4E is a Brussels-based international practice that concerns itself with matters of architectural design, concept development and strategic spatial transformations. It is led by Johan Anrys and Freek Persyn. It was founded in 1998 and gained renown through key projects such as Lamot (2005), TID Tower Tirana (2004- ), C-Mine (2010), Skanderbeg Square (2008) and BUDA factory (2012).

51N4E has been rewarded with different international prizes for the architectural projects, while it has recently engaged in the development of strategic visions for large-scale urban regions such as Bordeaux (50.000 dwellings), Brussels (Bruxelles Metropole 2040) and Istanbul (Making City).