The core of the early town appears to have lain around what is now the Laigh Kirk (Low Church), although the oldest parts of the current building are no earlier than the 17th century, extending north and northwest. A comparatively modest settlement until the industrial revolution, Kilmarnock extended considerably from around 1800 onwards. This resulted in formal, planned developments such as King Street, Portland Street, Saint Marnock Street, and latterly John Finnie Street; the latter often suggested as one of the finest Victorian planned streets in Scotland.