New office build celebrated in Adelaide as CBD vacancies increase to highest level since 2017 FriFriday 26 An artistic impression of the 20-storey office block being constructed on Pirie Street. ( Print text only Cancel There's a certain irony to commencing construction of a 20-storey office building while surrounded by commercial vacancy signs, but according to the South Australian government, it's good for jobs and investment. Key points: Adelaide's office vacancy rate has soared to 16 per cent due to new builds and COVID-19 A large South Australian government department will move into a new 20-storey office block once it is built Despite the building's contribution to the office glut, stakeholders believe the investment is worth it