Work has also begun this week on 11 Waymouth St, which sits behind the GPO development and was bought by Singapore investment powerhouse Mapletree for $202.5 million in late 2017.

Construction of the tower, which will have BHP’s logo emblazoned on the 20th floor of the GPO Exchange building, is expected to be completed in the third quarter of next year.

Todd was South Australia’s postmaster-general and his legacy is celebrated at the new Adelaide Marriott in a stunning transformation of the city’s 1867-built GPO, looming over the corner of ...