The chosen contractor will complete transformative works on the historic gardens, first opened in 1879.
The design includes a new walkway from Union Street; landscaping and lighting; pavilions on Union Street, Union Terrace and Rosemount Viaduct; and the refurbishment of the Union Terrace arches.
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Councillor Marie Boulton, lead on the City Centre Masterplan, said: "There has already been significant interest from the construction supply chain in what is a hugely prestigious project and we look forward to seeing the response to the tender invitation.
"The design respects the heritage value of the site and our aspirations for it to be a high-quality inclusive space.
"In selecting a construction company, we will be equally rigorous and ensure we have the very best people for the job whilst delivering value for money for the public."
Bids for the work are expected to take 18-24 months and will be brought back to the Council for consideration.
(CM/MH)
