The municipal and county (city) (bureau) competent authorities of construction shall define the borderlines of the roads already announced as the building lines. Where it is prescribed in the detail plan that the buildings must be setback, such prescription shall apply.
For the existing laneways other than described in the above paragraph, building lines shall be otherwise determined where it is deemed as necessary by the municipal or county (city) (bureau) competent authority of construction, and the determination method shall be prescribed in the regulations on construction management.

The buildings to be constructed along the two sides of the roads announced under this Code but not constructed or widened yet shall be setback according to the building lines designated by the municipal or county (city) (bureau) competent authorities.

For the necessity of maintaining traffic safety, scenery spots or other requirements, the municipal and county (city) (bureau) competent authorities may work out regulations to setback the buildings at road intersections and facing rivers, lakes or squares.
The above-mentioned regulations on retraction shall be reported to the Ministry of the Interior for review and approval.

Buildings may not stand out of the building lines, unless it is approved by the municipal or county (city) (bureau) competent authorities of construction for the monumental buildings as well as the buildings required for public welfare or in short term and without affecting the traffic.

The municipal or county (city) (bureau) competent authorities of construction shall expropriate the lands for which retraction is executed under Articles 49 and 50, and the compensation for expropriation shall be handled pursuant to the Urban Planning Act.