Contractor Cubic Works is to carry out the refurbishment of the listed Eastern House and Langley Buildings in Manchester, creating 75,000 sq ft of workspace.
Having withdrawn earlier proposals last year, Wittington Investments resubmitted plans for the scheme in June.
Under the refreshed plans, approved by Manchester City Council, the upper floors of 40-46 Princess Street are to be revamped to provide modern workspace.
Wittington Investments’ proposals also feature a 16,500 sq ft gym across two basement levels.
The buildings previously housed a nightclub at the basement levels, restaurants at ground floor level, and small suite office accommodation managed by Citibase on the five upper floors.
However, the properties are now vacant.
In 2017, Wittington won approval to refurbish the buildings to create modern office accommodation but withdrew the plans last July.
At the time, chief executive of Wittington’s property division Kevin Boylan said the firm planned to rethink its approach to the project in light of the Covid-19 pandemic.
Wittington subsequently rejigged the project team for the scheme. Zerum was replaced by Paul Butler Associates as planning consultant and Bridge Architects took over from Ipswich-based Engine Room.
The refurbishment is expected to begin this month and take a year to complete.
The project team for Princess Street also includes In4m as project manager, Curtins as structural engineer, and Crookes Walker Consulting advising on M&E.
BB Heritage Studio is the heritage consultant for the project, while Walker Sime is the cost consultant.
Wittington, a privately owned investment company, is 79.2% owned by the Garfield Weston Foundation. Elsewhere in Manchester the firm owns the Express Building on Great Ancoats Street, and No1 Balloon Street.
The company also owns upmarket department store Fortnum & Mason.