The sellers realtor's job is to do market analysis and price the property accordingly. If the sellers realtor did there job correctly then the asking price should be a correct asessment of value.

There are different types of housing values available. One type of housing value is the assessed home value which is assessed usually by your county auditor. Usually your assessed home value is less than the actual market value of your home may be. This is usually a good thing because the assessed value of your home is generally the basis for your property taxes.

Often, the asking price for the home is based upon comparable sales in the area - similar homes that have sold recently. Using the selling prices for those homes, they can determine what the home should sell for, and price the home accordingly.

Before buying (or selling) it is wise to do some homework and look at what similar homes in your neighborhood or town have sold for recently. This information is available at county recorders offices, town offices, and from some websites. Of course, the ultimate is to have an appraisal done by a professional appraiser. This will be done anyway before any lender provides the purchase money loan.

There are several online sites that can give you an estimate of your home's value. However, whether you are buying or selling, a real estate agent has access to the latest sales data and can give you a more accurate value for your home.
If you don't already have a real estate agent, call me and I can recommend one. 718-886-4438