The judges said the park is unique in its conception and execution and the city has an asset it can be immensely proud of.
The award was collected by Edwards White principal Brian White, who said the project had been very satisfying.
"So often, as architects, you complete a project and don't get to see people use it or interact with it. With a project such a this, we have been able to observe people interacting with it. To see and hear the public excited and positive as they discover it for the first time has been hugely rewarding," he said.
The Council's parks and recreation manager, Maria Barrie, said the design and construction of Victoria on the River saw a car park and challenging slope transformed into a world-class park Hamiltonians and visitors are enjoying.
"Edwards White's design responded to some very difficult terrain, and also our desire to link the park with our popular network of river paths," she said.
"We delighted to get recognition from the local property sector."