The company, which last year announced plans to close the Dunedin factory in March, with the loss of about 350 jobs, also committed to a $7million redevelopment of Cadbury World.
The multimillion-dollar project would result in Cadbury World being shifted to the old dairy site in Castle St, doubling the number of full-time equivalent jobs associated with the attraction from 25 to 50.
The building itself was to be earthquake-strengthened and restored, including the return of heritage features stripped from the building during the 1950s.
The work would return the building to a design based on the 1930s Cadbury Fry Hudson era, when the building was the company's headquarters and its main entrance was on Castle St.
Mondelez Dunedin site manager Judith Mair said this week work on the building was ''progressing well''.
It now had a new roof and exterior and internal structural elements were ''almost done'', she said in a statement.
The design of a new visitor area was also ''progressing well'', and work would resume shortly after a break over the holiday period, including work on the building's exterior features, she indicated.
The company planned to continue the operation of the existing Cadbury World until the new attraction was ready to open next year, in time for the cruise ship season, she said.
''We plan to use the old Cadbury World building as an administration and storage area to support the redeveloped attraction.''
In the meantime, it was expected the sale process for the rest of the site would begin within weeks.
A Mondelez spokesman said at the time the aim was to find a buyer whose plans would benefit Dunedin.
''We expect it to kick off in the coming weeks and as with any commercial sale process, we may be limited in what we can say during the process itself,'' a Mondelez spokesman said.
The site has previously been suggested as a possible location for the rebuild of Dunedin Hospital, but the Local Advisory Group to the project is continuing to examine possible sites between the University of Otago and the Octagon.
Health Minister David Clark, speaking in Dunedin last Friday, said he expected a final recommendation by the end of March.
