The first of three tower cranes has been erected to build the No1 Spinningfields building for developer Allied London.
The 117 metre tall crane will remain in place for 63 weeks, helping to develop the 24-storey structure.
Last week, 860 cubic metres of concrete was poured to form the 'core 1 base' of the structure.
Tony Grindrod, construction director for BAM, said: "This may be the biggest single concrete pour BAM has ever done and it forms the base of the Core 1 structure that will support the 23 storey concrete core above along with the 60 concrete piles each passing down 20m into the bedrock below.
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"Over the next few weeks a Slipform rig will be erected on site 26m by 20m in plan that will be used to form the core which is nearly 100m tall.
"The No1 Spinningfields project will gather pace in the new year when the structural steelwork starts to emerge from the basement and follow the concrete core up the building with a workforce of over 600 expected to be involved in the project at its peak."
Graham Skinner, Allied London's Development Director, added: "It is great to see that we are on schedule with the construction programme for No.1 Spinningfields, which will be a world-class commercial office building in one of Europe's most successful regeneration developments."
(LM)
