Wouldn't matter if a realtor did. A realtor is not a qualified, certified, licensed property appraiser. You may need to seek the services of a qualified, certified and licensed property appraiser in the area that has been in business for at least the last 10 years. They can do an appraisal for both current value, and 2007 value with no problem. They will have records going back that far (if they've been in business that long) and can therefore provide you an appraisal of the property's value for that far back.
You will have to be present for the walk through, which generally takes a few hours so you can answer questions about how things were back then with the property, as well as identify property improvements that were not present in 2007. Cost for the a appraisal is generally in the $300-500 range and if the appraisal is for the purpose of selling the property, it's a deductible sales expense provided you sell the property in the same tax year as the appraisal.
Additionally, if this is an estate sale, the estate can pay for the appraisal.
