Gary Humphries has saved the York Park oak plantation from becoming a carpark.
Last year a federal government department thought it might like to remove about two-thirds of the trees so it could build more offices and carparks in the area.
The oak trees in this particular area were planted, at least in part, by the Duke and Duchess of York when they came to open what is now Old Parliament House in 1927 (the Duke of York went on to become King George VI because of Wallis Simpson).
Senator Humphries took up the fight for the trees with Territories Minister Jim Lloyd who has now tabled an amendment to the National Capital Plan, protecting all of the trees from development.