you can hunt that up online thru the MLS service. It also lists all the 'active with contract' and the 'sold' points for specific areas. it goes back about 4 years or so, and that gives a good indication of what the true value is.
Then I would call several leading real estate companies and ask questions.
Then, if you have both a financial planner and a lawyer, ask them questions as well.
The more information you have the better you will be in order to make a decision.