Exeter City Council says it needs more time to look at tenders before appointing contractors to create its part of the major re-development scheme.
It had planned to start construction on new leisure complex St Sidwell's Point, and a new Exeter Bus Station, at the end of March.
It was due to be completed at the end of next year.
Sidwell Street was going to have been made into a temporary bus facility while the work was carried out.
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