The majority of the built fabric of this area dates to the late Victorian and Edwardian period although significant elements of the street pattern (such as Townhead, Cambridge Street and Barkers Pool) date to the post-medieval expansion of the original medieval settlement of Sheffield and are shown as thoroughfares on the 1736 Gosling map of the town. Early survivals in the area include the early 19th century 'Leah's Yard' and 'Bethel Sunday School' on Cambridge Street. These buildings provide fragmentary legibility of the 18th and 19th century expansion of the city into the grid iron developments of the present Devonshire Quarter. Fragmentary legibility of the early post-medieval city is also provided by the open space of Barker's Pool (the site of an early water supply reservoir), which originated as 'Balm Green'. The present character derives from the latter 19th and early 20th century rebuilding of the town as it became a major urban centre. The polygon includes the former education buildings of Leopold Street (late 19th century) and the early twentieth century City Hall, and Steel City House. The coherence of the area has been reduced by the rebuilding of much of the environs of Barker's Pool as a department store (John Lewis - ex. Cole Bros.) and office development (the 'Fountain Precinct') in the mid to late 20th century.