From the mid-1930s onwards, large annexes were erected along Bendlerstraße according to plans designed by Wilhelm Kreis. From 1938 the enlarged "Bendlerblock" again was used by the Seekriegsleitung (Maritime Warfare Command) of the Oberkommando der Marine and the OKW Amt Abwehr. The main building served the General Army Office of the Oberkommando des Heeres (OKH)[1] under General Friedrich Fromm, succeeded by General Friedrich Olbricht in 1940, and still as seat of the commander-in-chief of the German Army (Heer).