What defines a "Brownstone"?

A "Brownstone" is defined as a rowhouse originally built of brown sandstone. This type of architecture emerged in the 19th century, particularly in New York City, where many of these homes were constructed using this distinctive stone, giving them their characteristic brown color. Brownstones are typically two to four stories high and feature a stoop leading up to the entrance, which is a notable design element of these buildings.

In contrast, the other options refer to different types of structures that do not share the same historical and architectural context. A modern apartment building with a glass facade represents a contemporary design approach, moving away from the traditional materials and styles associated with brownstones. Similarly, a type of condominium or a high-rise residential tower implies different constructions that are likely to incorporate modern materials and designs rather than the classic brown sandstone associated with brownstones. Understanding this architectural lineage and material use helps clarify what makes brownstones unique in the landscape of New York City.