In the location's words:

The THF TOWER at Tempelhof Airport offers an unforgettable visitor experience: on the wood-paneled roof terrace, you can enjoy the view over the city and Tempelhof Field and be a little closer to the Berlin sky.

The statically renovated staircase, which seems to float on the historic building structure, leads you to the exhibition and event area on the 6th floor (also accessible without barriers).