Two unusual features distinguish the new high- rise structure. The brick and precast concrete cladding is in sharp contrast to the all-glass facades of many nearby high-rise towers. This helps HYLO blend well with adjacent brick residential buildings. Also, by retaining the 16-storey existing structure and extending upward by 70% and sideways by 24%, it doubled the net rentable space, while reducing the embodied carbon by 35%, compared with new construction. The original Finsbury Tower sat clumsily on a low podium stretching further to the north and south. The tower has now been brought to ground and the two podium elements to the north and south extended upwards from four to seven storeys. With insufficient lift shafts to service the extra space, two new cores were built on the northern corners of the tower to house high-speed double-deck lifts. The project team evaluated the existing structure using time-dependent, finite-element analysis to understand existing and proposed construction throughout its past and future life cycle. The substructure and superstructure were capable of supporting 13 steel frame and composite concrete floors with some localised column strengthening.
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