Shannon's Jewellers, 2-4 Market Square North, Lisburn, County Antrim, BT28 1XB

Shannon's Jewellers is a corner-sited, terraced two-storey neo-classical building erected c.1924 on Market Square North and Railway Street in Lisburn. Built as a branch of the Northern Banking Company, it now operates as a jeweller's shop. The building was designed by Belfast architect Henry Seaver and constructed by Messrs Dowling Ltd of Cromwell Road, Belfast.

The building is constructed of machine-made redbrick laid in Flemish bond with Portland limestone ashlar and a raised granite ashlar plinth course up to sill level. It displays a hipped slate roof hidden behind a redbrick parapet wall with moulded stone coping and resting on a moulded cornice. Paired octagonal Portland limestone chimneystacks with terracotta pots and rectangular bases rise from the parapet wall to the south elevation, with a further redbrick chimneystack to the west party wall.

The south elevation, facing Market Square, comprises five bays. A central oversized pediment forms a shallow breakfront to the central three bays, rising above the parapet wall with a raking cornice and central carved cartouche to the tympanum framing the anagram "CBN" and stating "ESTABLISHED 1824". A continuous plain frieze composed of two courses of Portland limestone ashlar is supported on six giant Doric pilasters with simple moulded capitals and three recessed discs to each, framing each bay. The pilasters rise from a raised granite ashlar plinth course with simple moulding broken by ground floor window openings. Segmental-headed window openings above the ground floor contain single-pane timber sash windows with ogee horns and moulded limestone sills. The ground floor features square-headed window openings with replacement large fixed-pane timber-frame display windows set in Portland limestone surrounds with simple fluted course above and simple moulded sills. A similar display window occupies a former canopied door opening to the left bay, with a segmental pediment supported on oversized scrolled console brackets executed in Portland limestone. Square-headed door openings with large segmental pediments supported on large scrolled console brackets have replacement glazed doors.

The east elevation facing Railway Street comprises six bays detailed as per the south elevation, with two windows to the central bay and a pedimented entrance to the left bay featuring replacement glazed doors, a granite fascia panel and rectangular overlight. The west elevation is abutted by the adjoining building at number 6 Market Square.

Historically, the site was formerly occupied by the Hertford Arms Hotel. A branch of the Northern Bank had operated in Lisburn since 1835, but did not occupy the present site until 1872. The building was completed in 1924, the centenary year of the Northern Bank's foundation. According to the Irish Builder of 25 June 1924, the banking hall occupied the greater portion of the 60 feet by 40 feet ground floor, with a strong room at the rear measuring 20 feet by 8 feet and fitted with massive steel doors and grille. Bank fittings were executed in Spanish mahogany. The building achieved particular historical significance as the site where District Inspector Oswald Ross Swanzy of the Royal Irish Constabulary was shot and killed on 22 August 1920, an event that sparked serious sectarian riots in Lisburn's history.

The building was converted to retail use c.2000, with the interior layout substantially changed and largely losing its original interior detailing. Despite these alterations, the fine exterior detailing remains relatively intact, constituting a good example of early twentieth-century neo-classicism in the Lisburn area. The building stands within a conservation area.