Greystones are a style of residential building most commonly found in Chicago, Illinois. As the name suggests, the buildings are typically grey in color and were most often built with Bedford Limestone quarried from South Central Indiana. In Chicago, there are roughly 30,000 greystones, usually built as a semi- or fully detached townhouse. The term "greystone" is also used to refer to buildings in Montreal, Quebec, Canada (known in French as pierre grise). It refers to the grey limestone facades of many buildings, both residential and institutional, constructed between 1730 and 1920.