What is the frontage dimension of Sam's property?

The frontage dimension of a property refers to the measurement of the property line that borders the street or access point. In this case, the correct answer is 105 feet, which indicates that the property in question has this specific measurement along its front edge, where it meets the road or access.

This dimension is crucial for various reasons, including determining setbacks, zoning compliance, and potential development options. Properly understanding and measuring the frontage helps ensure that any construction or use of the property adheres to local regulations and maximizes usability.

The other options present different measurements that do not accurately represent the property's frontage, and thus do not reflect the specific legal or physical attributes associated with how the property interacts with its boundary lines in relation to the roadway.