The former NATO facility was acquired in 2013 from the Office for Geoinformation of the Bundeswehr, by an unidentified Dutchman, who is the chief suspect. Press reports at the time describe the site as a multi-story protective structure with a floor space of 5,500 square meters. It has two adjacent office buildings with a total floor space of 4,300 square meters and is set on 13-hectares of land.