On the night of the auction, it was only revealed that the buyer was a private European collector, sparking concern that the skeleton might remain hidden, out of reach of researchers and the public.
But on Friday, Koller announced the buyer was The Phoebus Foundation, a non-profit art foundation.
"Phoebus has announced their intention to show Trinity to the public in their Boerentoren cultural center project in Antwerp," Koller said in a statement.
Estimated to be 65 to 67 million years old, the skeleton called Trinity was made up of bones from three different T-Rexes. It sold at the Koller auction house in Zurich on Tuesday for 5.5 million Swiss francs ($6.1 million).
Once ready, Trinity, which drew some 35,000 visitors during the two-and-a-half weeks it was on display in Zurich before the auction, will become a permanent fixture in the new cultural centre.
While waiting for the Boerentoren centre to be completed, "we are exploring the possibility of lending Trinity to a museum in the meantime, so that the public can already enjoy this unique specimen," Phoebus Foundation chief of staff Katharina Van Cauteren said.
"Scientists also need not worry: like the rest of our collection, Trinity is available for research," she said.
Koller auction house owner and chief Cyril Koller hailed the purchase, saying: "We are extremely pleased that Trinity will be made available to the public and to science."