Grade I historic buildings in Hong Kong are those selected as those "outstanding merits of which every effort should be made to preserve if possible". These buildings may be protected under the Antiquities and Monuments Ordinance; after consulting the Antiquities Advisory Board, with the approval of the Chief Executive and the publication of the notice in government gazette, the Antiquities Authority may legally declare the Graded historic buildings to be protected as Declared Monuments. Five Grade I historic buildings have been demolished in the last two decades.