The land for the stadium was bought by Walter Schoeller who passed it on his club free of charge.
After many reconstructions the capacity was 38,000 in 1986, on time for the 100-Year Anniversary of the Grasshopper Club Zürich.
Before closing, Hardturm could hold 17,666 spectators with standing areas for the home and away fans.
In international games the Hardturm could hold 16,600 spectators with seating places in all areas.
[1] During re-construction of the Letzigrund stadium, Grasshoppers shared use of the Hardturm with local rivals FC Zürich for the 2006–07 season.