Mostyn Art Gallery, including Office and Shop on ground floor

The Mostyn Art Gallery, along with its ground floor office and shop, dates from the early 20th century. The building is three storeys and has an attic, originally designed with five bays, but now with three. It is faced with red brick and terracotta, topped with a slate roof and a pyramidal spire. The attic window is set within a decorative aedicule featuring rusticated pilasters, capitals, and a broken triangular pediment. This window is flanked on each side by panels of two blind, cusped lights with pilasters and octagonal finials. The window to the right of this central feature has rusticated columns and pilasters, cornices with egg and dart mouldings, and segmental pediments decorated with medallion reliefs within the tympana. A moulded and modillion eaves cornice runs around the building, with semi-octagonal pilasters in the centre bay and plain pilasters on the outer bays. The second-floor window above the entrance has three lights with moulded architraves; the central light has a lunette above it, and the side lights have ornately worked panels. The two second-floor bays to the right of the central window each feature a larger lunette with a rusticated architrave, with female figures in relief in the spandrils and keystones with medallions rising into tympana. The first floor has three sash lights above the entrance, with a moulded architrave and a cornice bearing the words "Mostyn Art Gallery." To the right, there are two canted bay windows with moulded architraves, cornices with egg and dart moulding, and ornately panelled parapets. Panels above the front windows read "AD" or "1901," and the side panels are ornamented with swags in relief. The ground floor entrance bay has a wide, ornate, semi-circular headed doorway with a broken pediment. A large, elaborate plate-glass shop front with Art Nouveau detailing is located to the right; a half-glazed doorway with an overlight featuring scrolls is recessed between convex display windows with slender colonettes. Pilasters incorporate reliefs of female heads in the capitals, and the frieze blocks are ornamented with square panels. The arch's keystone is in the form of a cartouche with a bust of a winged female figure. An early 20th-century cast-iron veranda with a glazed roof extends for four bays. The entrance bay is formed as a semi-circular and gabled canopy with ridge cresting and a finial, with the words "Mostyn Art Gallery" above the gable. This canopy features circular columns which are fluted at the base and have capitals, spandrils, and cresting at the lower soffit.