Your friend is right the adjective rule (which is not a law) in which the adjective is most commonly used after the noun does not apply to building floors except the ground floor which is piso bajo (PB in elavators).
Come to think of it there may be an exception to the adjective rule for all
numbered nouns. For example: Fifth Avenue is La Quinta Avenida much like
el segundo piso. The meaning is completely different with the adjective after the numbered object. I would like to hear what other people have to say about this.
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