An office building at 50 Marcus Clarke Street in the city has reportedly sold to a South Korean investment group for a record-breaking price of about $321 million.
If officially confirmed, it will be the biggest sale of a Canberra office building on record.
The previous record was set in 2006 when Symonston's Geoscience Building sold for $234.1 million.
The CBD property has reportedly sold to Mirae Asset Global Investments via CBRE, JLL and Richard Butler Real Estate, who declined to comment on the sale.
It is positioned on a 4801-square-metre block and boasts a net lettable area of 40,201 square metres.
Tenants include the Department of Education and Training and the Australian Electoral Commission.
The 15-year lease with the Department of Education commenced in 2010.
Most foreign investors are looking for properties over $100 million and government agency tenants on a long-term lease are particularly attractive.
Asian investors made up about 37 per cent of buyers in the Canberra commercial market between 2010 and 2016.