I hear accounts of the floors of buildings (7)

I believe the answer is:

storeys

I'm a little stuck... Click here to teach me more about this clue!

'floors of buildings' is the definition.
'storeys' can be an answer for 'floors' ('storey' can be a synonym of 'floor'). I am unsure of the 'of buildings' bit.

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for storeys that I've seen before include "Levels of a building" , "Floors, levels" .)

I've seen this clue in the Sydney Morning Herald.

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