text: I had a look today, they are clearly visible from the top on Blenheim Place. Between the two buildings is a couple of flights of semi-enclosed private steps.
  
  I think the top section should definitely still be mapped, but not so sure about the lower part. They are visible from the street at Greenside End, but are as Rostranimin suggests, almost like internal steps in a tenement.
  
  Without just 'tagging for the renderer' is there is a way to tag this lower section as something like building=steps (19 uses) or building:steps=yes.