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Hi. Which one is correct?

There are stores on the first and second floor/floors.

See, I wouldn't have problems with such a sentence as this as the adjectives seem to describe the noun as a whole.

There is furniture in the small and disorganized room of his.
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There are two floors. The first floor and the second floor. There are stores on the first and second floors.
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Thank you, Is this correct?

The stores are on the first and the second floor.
Yes, that is correct.