Neil, a small thing is really a three storey building, but it is situated a bit further away. My guess is that the big structure is about three times as high, not five times as it seems
Many thanks for comments. This is a part of a futuristic building in Birmingham, UK. No idea what is used for: I had to catch my plane. DOF: in SLR terms this is shot approx. with 45 mm focal length and 16 aperture, the shown part of the building was approx. 100 meters from me, no surprise that both buildings are sharp