Junkers Ju 52/3mge D-ASIS, Werknummer 4074, Wilhelm Cuno, of Deutsche Lufthansa (top and detail enlargement at center), pictured on the apron of Berlin-Tempelhof airfield, before the airport's complete transformation by Ernst Sagebiel. As D-ASIS was built in 1935, the photo was taken in the second half of the 1930s, although the exact date currently remains unknown to me.
The aircraft seen protruding from the hangar at left (detail enlargement at bottom) is likely Ju 52/3m D-AQIT (the "T" appears to be partially obscured by the tailplane), Werknummer 5112 (Stammkennzeichen DD+MG), Major Dincklage, of the Regierungsstaffel [government squadron]. This would make it the personal aircraft of German Labour Front leader Dr. Robert Ley.
Alternatively, the aircraft might be Ju 52/3m D-AQII, although a look at the spacing of the letters of the registration seems to make this appear unlikely. (Fischer collection, with thanks to Christian M. Aguilar and Armin W., via luftwaffe-research-group.org, for further information)