Kohn Pedersen Fox Associates
CIT Developments LLP
The transformation of this 1970s office scheme into a landmark structure was made possible through the use of innovative design solutions that are reliant on the use of structural steel.
The existing podium floorplates have been extended with two new floors added, whilst the podium building’s cores have been strategically relocated, opening out office space, promoting the ingress of natural light and encouraging a collaborative working environment. The use of a steel structure helped to minimise the loading onto existing foundations.
Within the tower the loadings from an additional 11 storeys of residential accommodation are carried through the extended core rather than the external columns, which had limited additional capacity. This was possible by hanging the new structure off the central core utilising a combination of a tension bar system and cantilevering steelwork in conjunction with lightweight concrete floor slabs.
The re-use of a redundant concrete office block for upmarket residential accommodation, with extension upwards and horizontally, led to enormous structural complexity. The merits of steelwork enable a great increase in the number of storeys, in spite of the foundation constraints.
The team worked well together to meet the tight programme and satisfy the planners and the client.