The winning design was influenced by both historic and contemporary structures, and some historic buildings and spaces have been identified for restoration.
A new park and a network of pathways that extend from the city will contain a series of lawned terraces, water channels and shade structures.
A lotus pool with waterfalls, interactive fountains and a reflecting solar pool will provide a symbol of regeneration at an important gateway to the city.
The design will encourage people to walk along the historic city wall, which will form a connection between the city and its park.
BDP director Nick Edwards said: "Nan Tou is a hidden treasure with a proud and important history. It contains many valuable built and natural assets, has characterful streets and spaces, is largely free from vehicles and has the potential to be a great place in which to live, work and spend time.
"This project presents a tremendous opportunity to incrementally repair the buildings, public realm and open spaces of the city in a way that respects its heritage and the needs of its people."