Landlords who provide tenants impacted by COVID-19 with rent relief may be eligible for a 25% reduction on the land tax payable on a parcel of land in the 2019-20 land tax year.

Relief is also available to residential and non-residential landowners who are unable to secure a tenant because of COVID-19. To be eligible for land tax relief, eligible landlords will need to demonstrate that the land was leased to 30 March 2020, but has since been vacant due to the impact of COVID-19.

https://www.covid-19.sa.gov.au/business-and-work/support-for-businesses