- 31 Parcels are rated (1) VERY SIGNIFICANT, which retain very good integrity, one-of-a-kind or unique properties.
- 517 parcels are rated as (2) SIGNIFICANT, which retain good integrity, contributing to the historic character of Grass Valley.
- 437 parcels (3) LACK SIGNIFICANCE, where major alterations or additions have dropped the integrity level. The rating may be recoverable through restoration.
- 272 Parcels are considered (4) MODERN INFILL, where the historic fabric is not present.
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