The news comes exactly 12 months after the practice won a hotly contested international RIBA competition to redesign the plaza. (AJ 13.06.05).
Bonn Square, one of Oxford's few public spaces, is blighted by high levels of crime and anti-social behaviour. It falls inside the boundary of the Oxford Central Conservation Area and contains a plethora of listed buildings.
According to Massie, the square's fragmented layout, lack of natural surveillance and neglected appearance make it a focus for criminal and anti-social behaviour.
Massie says his 'radical reinterpretation' aims to achieve a 'material dialogue with the fabric of Oxford' by arranging 'sawn and split faces in different configurations'.
He added: 'To achieve spatial clarity and improve permeability, a continuous, taut sandstone surface is folded over the extent of the square, encompassing and retaining in-situ the archaeological remains of a Georgian church and its cemetery.
'Beneath a grove of trees the surface is further elaborated with black Caithness flagstone setts arranged in a random configuration giving the impression of dappled shadows.
'The use of tone, modulation and varying textures will lead to an expressive surface, which, over time, will wear, providing a trace of people's movements through the square, in a similar manner to that encountered in the old stone stairs of the university colleges.'
Work on the Bonn Square refit is scheduled to start on site in 2008.