Farmers Trading Company has bought the building it tenanted for 40 years for just over $13 million.
The building, one of the largest in the CBD, was put up for sale by the trustees of the Parnwell Trust Partnership last month.
The building sold for $13,271,500 to The Farmers Trading Company on Thursday.
In a statement released through lawyers Sharp Tudhope, the Parnwell Family said they were "particularly pleased" that Farmers was the successful purchaser of the property, given the "longstanding and co-operative relationship" they have had with Farmers, which occupied the CBD site for more than 40 years.
Simon Clark, manager of Colliers, said it was fantastic for the CBD that Farmers was staying at its existing site.