A quick look at the 3bd townhouses in the Heatherfield subdivision shows only 1 that has closed in the last 6 months (it just closed on July 27th) at $675,000. If there are more, the listing agents haven't specified the subdivision.
If you need a more in depth comparative market analysis, feel free to contact me and we can set up an appointment. I have an appointment in the Glen next week and could meet with you before or after that if it works. Otherwise, we can work out another time.