This building, also shown in [1], has an entrance on the first floor and you need the stairs or a very long ramp to get inside (the latter probably for wheelchair users). This solution actually looks like a bit of overkill but luckily the ramp has several flat sections midway where visitors can pause before they continue their travel to the top.
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In photo 2 the stairs located at the top of the ramp where it connects to the second section leading into the building.
[1] More photos from the building itself in Campus 4 (Photos 2016-1).
