As a result of land subdivision, what was 289 Sharp Road is know known as Ridgewater Lane. The street numbers shown are correct. This new situation can be confirmed by looking up Auckland Council GIS.
Specifically
1. The right-of-way should be named Ridgewater Lane from where it joins 289 Sharp Road to where it turns 90 degrees. 
2. The short section from the 90 degree turn to Beach Street crosses multiple private properties and is NOT available to the public. Ideally it should be removed