Brownstone's a brown Triassic sandstone which was once a popular building material. The term's also understood to be a terraced house (rowhouse) clad in this material. Brownstone dwellings In Chicago, a brownstone typically refers to a free-standing house, originally built for a single family, clad in brownstone. While many Chicago brownstones have subsequently been split into multiple rental or condominium units, many others remain single-family homes. A lot of Brownstones are also found in B… (More on Brownstone)