prior sales

This is my first time posting so I hope I'm doing this right! My commercial appraisal company is based in the southeast but does work on occasion all over the country. Right now we have a job for some land in New England. I'm struggling to find a decent program to search for prior sales comps...

Greetings Appraisers - We recently did a standard 1073 on a higher end unit on the first floor end unit of a mid rise building on the bay across the street from the gulf of mexico. The unit appraised for significantly higher than the prior sale, but the prior sale was 2 months outside the 3...