There's no single, universally known "brownstone" in the context of elementary schools. Brownstones are a type of building, not a feature typically found *inside* an elementary school. The term might be used in a specific story, book, movie, or local context. To answer your question, I need more information, such as:
* What elementary school are you referring to? (Name and location)
* Is this from a book, movie, or other media? If so, please specify the title.
With more details, I might be able to help you locate the brownstone.