50 Years or Older
The structure or site must be at least 50 years old and satisfy one or more of the following ten criteria for architectural, historical, or cultural significance:
- Represents a specific architectural style or period
- Represents a unique example of a structure or building type
- Represents an innovation in construction, materials, or design
- Demonstrates superior craftsmanship or high artistic value
- Is an example of the work of a master architect or builder
- Represents the built environment of a group of people in an era of history
- Is associated with a significant historic event
- Is associated with a notable person or the work of a notable person
- Exemplifies the cultural, political, economic, or social heritage of the community
- Has the potential to make an important contribution to the knowledge of the area's history or prehistory
Less than 50 Years Old
A property less than 50 years of age may be designated if it is of exceptional historical, cultural, or architectural importance.