159. A special planning zone shall be created in order to ensure(1) the protection of sites which are of special value to the general community, particularly, of historical, cultural, scientific, aesthetic, recreational or ecological value;
(2) the protection, improvement, renewal or exploitation of natural resources which are of exceptional interest to the general community, such as bodies of water and their shorelines, forests, mines, quarries and sand pits;
(3) the installation and setting up of public services and infrastructure, and the planning of real estate developments established of initiated by public or private investment;
(4) the solution of a development problem the urgency or seriousness of which, in the opinion of the Government, justifies its intervention.