どこ vs なん which one is better in the sentence?


> Q: あの立派な建物は何ですか。／あの立派な建物は何処ですか。  
>  A: あの立派な建物は留学生食堂です。

Which of the question sounds more natural in the given context?




Only interrogative word 何{なん} works here, because the reply gives information
about the function/nature of the building as opposed to where it is.

どこ would work in a context like this:

> 写真で見た立派な建物は何処ですか？  
>  食堂の後ろです。




Only interrogative word 何{なん} works here, because the reply gives information
about the function/nature of the building as opposed to where it is.

どこ would work in a context like this:

> 写真で見た立派な建物は何処ですか？  
>  食堂の後ろです。

