There are currently 7 plots of an acre or more for sale in this zip code. Two are in the same general area you mention. 5 acres for $399,000 and 15 for $899,000. There has only been one similar sale in the past two years. A 5 acre plot sold for $325,000 in June 2008.
I'm sure you are aware that your land is very near to the new "medical city" and depending on it's exact location and layout could be very attractive to other investors.
Marketing and selling a plot, especially if it's undeveloped, is a lot different than residential. I'm not an expert in this field, but we have a gentleman in our office who is THE vacant land sales and marketing expert for this area with over 80 land sales to his credit. What I do have is expertise in is working with foregn clients. I have a several now and lived in the UK for 6 years and Europe for 18.
Please feel free to contact me for an introduction. Look forward to hearing from you.
Weichert, Realtors - Hallmark Properties