The Pavilion in the Park, the Great Field in Poundbury, has now received planning approval from Dorset Council.
It is expected that building will start in the Spring of 2020.
A revised plan was submitted earlier this year and, despite several objections, approval has been given.
The building is set to hold a café and community space. The original application was made to the council in January 2019.
The structure is to be primarily made of timber and now of single storey in design, where originally there were to be two floors with office space occupying that second floor.