Comparables for land can be trickier than for home sales in your area. Although the assessor's valuation on your taxes can provide a starting point, consider factors like whether your property has utilities to the property line, views, zoning and any preapproved building plans to determine its worth. Location is always one of the most critical factors. In San Francisco's Pacific Heights area, for example, a buildable cul-de-sac lot of less than 4,000 square feet can sell for more than $9 million.
If you want to investigate the situation on your property, you could always order an environmental report. They can either do a high-level look at it (without doing any soil sampling), or they can drill soil borings to verify if there are any chemicals in the soil (which of course, will cost more). I’m guessing you could find out more on whether or not it’s an issue to be concerned about with a quick phone conversation.
Market for Land is Less Active – The market for existing homes is almost always more vibrant than the land market. There simply are fewer numbers of buyers for vacant land than consumers looking for homes. Start marketing a new home listing and a new lot listing when both are desirable and priced well, and you generally can expect fewer contacts about the new lot listing.