Market value has many facets such as location, size, condition, upgrades, neighborhood values, competition, and more. You may need the services of a real estate appraiser to assist in getting an accurate market value range for that point in time. If that is not a possibility, you might want to contact your City Assessor's office to get information about sales which were occurring in May of 2009 in your neighborhood.
Our office offers a complimentary market analysis for sale purposes. Please call if you need further assistance.
Best, Charlotte Gardner