The Rotunda, including the shops in the podium below the tower

The Rotunda is a twenty-four-storey circular office tower built in the late 20th century on a single-storey, cuneiform-shaped podium. The building is situated on pilotis and incorporates ground-floor shops on the New Street and St Martins Circus sides. The tower's structure is reinforced concrete, clad in textured glass spandrel panels. The podium is partly clad in mosaic strips.

The base of the tower features set-back vertical windows within a wall originally clad in mosaic strips, which extended over the ground floor. In the early 21st century, the south elevation was entirely reclad in glass, and a new entrance to the shops was inserted into the east corner. Most of the ground floor has been extended to be flush with the first floor, except for the south-west elevation, which retains the original relationship between the first two floors and creates a contrast with the curve of the tower. This elevation was slightly extended to integrate with Atwood House, a building constructed in the 1970s, preserving the concave shape. The north-west elevation is obscured by an adjacent building. A two-storey recessed glass entrance has been added to the north-east elevation, framed by new mosaic strips matching the original podium fabric. The tower’s circular form is characterised by continuous bands of glazing contrasting with smooth panels. The mosaic panelling on the drum was replaced in the early 21st century with textured glass panels, accompanied by the replacement of the windows and an increase in their height. A steel frame parapet tops the tower.

The interiors of most floors above the second have been converted to flats in the early 21st century, with all interior features replaced and of no special interest. The third floor, formerly a Lloyds Bank strong room and distinguished by thick internal walls, remains unconverted. The top floor is still used for services. Two of the original five lift shafts have been retained, although refurbished with new machinery. One original staircase, featuring a concrete cantilever dogleg staircase and plain black terrazzo flooring on the bottom flight, has been preserved.

The ground-floor shops have been internally altered with the loss of original features. However, the former Lloyds Bank retains “The Rotunda Relief,” a circa 140 square-metre, ciment-fondu mural with abstract patterning by John Poole, which wraps around the drum of the tower; this is a feature of group value. Following a change of use and the insertion of a first floor into the retail unit, only part of the mural is visible; the remainder survives concealed behind plasterboard.