As part of the 2015-16 Mid-Year Budget Review, the Government announced that the commencement date for the first reduction of one-third of stamp duty on transfers of non-residential, non-primary production real property would be brought forward from 1 July 2016 to take effect from today, 7 December 2015.

Further information is available in Information Circular 86.
Source: https://www.revenuesa.sa.gov.au/home