"First, you exit the building."
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Many, many of the Duolingo sentences are broken when using IME input instead of the Word Bank. We poor souls that choose to use it have to deal with constantly being incorrectly marked as wrong due to Duolingo's arbitrary nature when it comes to which words it will accept in kanji-form.
I think it's a little bit more complicated than that. We only use を with transitive verbs, but 出る is intransitive. However we still use を because of the perlative object, which basically means you're no longer in the building. If you were still in the building, you'd like to use に instead, like in this example.
建物に入ります = I will enter the building
I found some more info here https://classicaljapanese.wordpress.com/tag/perlative/