Drop off at the building (4)
I believe the answer is:
shed
This might be a double definition.
'drop off' is the first definition.
'shed' can be an answer for 'drop' (synonyms). I'm not sure about the 'off' bit.
'the building' is the second definition.
(shed is a kind of building)
'at' is the link.
Can you help me to learn more?
(Other definitions for shed that I've seen before include "storage building" , "Simple building; discard" , "Removed in garden hut" , "Throw off; building" , "shelter" .)