The master plan proposed by Werner March in 1936 remains under urban historic preservation. All additions have been placed underground, outside of the stadium. The new roof structure with its open-ended ring towards the Marathon Gate sets itself apart from stadium typology with its simple construction and choice of surface material. The roof is designed as a light cantilevering steel construction with an upper and lower membrane. From the interior, the roof rests on 20 steel columns, which each have a slim profile of 25 cm in diameter. Read more at gmp-architekten.de