It's not a matter of "how historic" it is---the author clearly has no grasp on what historic means. It is - by virtue of it's age alone - historic.

As a rule of thumb, anything over 50 years old is considered historic. That being said, not everything that's old is significant.

It's level of significance is what needs to be focused on. The fact that it may be the oldest building in the county is reason enough to place it on the State and National registers.

It's historic function also plays a role in this.