 There are four criteria under which we evaluate properties at the National Register. They're simply A, B, C, and D. What these reflect are significance in historic events. That is criterion A. Significance as related to persons of importance in our past. That's criterion B. Criterion C is often referred to as the architecture criterion, but it's really about the physical qualities of the historic resource. And the fourth criterion is often referred to as the archaeology criterion. Criterion D is for properties that have yielded or are likely to yield information important in our past. The National Register of Historic Places only requires that a property meet one of our four National Register criteria. And within that criteria only needs to meet one potential area of significance. But this doesn't mean that properties can't have multiple levels of significance, that a property may not have multiple areas of significance, or a property may not meet multiple criteria of importance. A nomination form may identify a property as being significant at the local level in commerce under criterion A, but it also may be an excellent exemplary example of an architectural style that on a larger context at the state level is a significant example. So it could be significant locally under criterion A and statewide under criterion C.