Demolition work is nearing completion on Phase Two of the scheme which will sit alongside the completed Warehouse and Studio developments.
Phase Two is known as The Tower and will provide 170,000 sq ft of office space and 7,300 sq ft of retail/restaurant space.
Helical Bar has set aside around £70m to build The Tower and it is due for completion in the second quarter of 2018.
John Sisk was originally lined up for The Tower scheme at the back end of last year when work was due to start before Christmas.
The existing office building at 207 Old Street has been stripped back to its original frame and will be extended outwards and upwards and reclad.