| Grade 1 |
Buildings of outstanding merit, which every effort should be made to preserve if possible. |
| Grade 2 |
Buildings of special merit; efforts should be made to selectively preserve.
|
| Grade 3 |
Buildings of some merit; preservation in some form would be desirable and alternative means could be considered if preservation is not practicable.
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| * The definitions of gradings are internal guidelines adopted by the Antiquities Advisory Board and the Antiquities and Monuments Office for the preservation of historic buildings. |