Which sale would most likely require appraisal determination due to improvement?

The sale that would most likely require appraisal determination due to improvement is associated with the NU-7 property classification. This classification often pertains to properties that have undergone significant enhancements or changes, which can alter their market value. When substantial improvements are made to a property, such as renovations, additions, or updates that affect its overall condition and utility, an appraisal is typically carried out to assess the new value.

In contrast, other classifications like NU-10, NU-13, and NU-25 may refer to different categories or levels of properties that may not require the same level of appraisals for improvements or may not have had recent advancements impacting their valuation. Hence, options that do not focus on properties with significant improvements would not necessitate an appraisal determination in the same way as the NU-7, making it the most relevant choice in this context.