Office history

2009
Members of German Sustainable Building Council e.V. DGNB

2004
Members of Interessengemeinschaft Essener Wirtschaft e.V. IEW
Members of EWG - Essen Economic Development Agency mbH
Membership of Pro Ruhr District e. V., Essen

2003
Member of the NAX Network Architecture Exchange, Berlin

2000
Lecturer at the European Business School EBS in Berlin, Munich and Essen on planning basics for commercial real estate and cost controlling

2000
Membership of the GCSC German Council of shopping centres e. V., Ludwigsburg

1998
Transformation of the firm to a private limited company (GmbH)

1994
Mr. Stiens leaves the office management and Mr. Nattler takes over the office as sole owner
Office name: Nattler Architects Urban Planers and Engineers

1990
Dipl.Ing. Architect Heinz Nattler joins the office management
Office name: R. Stiens + H. Nattler Architects BDA

1980
Mr Gärtner leaves the office management.
Office name: R. Stiens architect BDA

1965
Dipl.Ing. Architect Ric Stiens joins the office management
Office name: E.A. Gardener + R. Stiens Architects BDA

1947
Foundation of the architecture and planning office by Dipl.Ing. Architect Ernst August Gärtner