 The building was completed in 1930 after only 24 months, by employing rapid-setting concrete, new construction materials and a round-the-clock workforce.Later in 1930, the Frankfurt director of horticulture Max Bromme and the artists' group Bornimer Kreis developed designs for the 14 hectares of parkland that surrounded the building.The grounds, and the complex as a whole, were completed in 1931 at a total cost of 24 million Reichsmark (equivalent to million €).