How is eBusiness changing the traditional marketplace? Solution The virtual-reality marketplace of the Internet is booming with sales. Transactions between businesses are in the tens of billions a year. And retail revenues are also in the billions already. Economic forecasters are predicting that the first annual trillion dollars of sales will be reached in two or three years. If more and more people and businesses start buying off the Web instead of going to stores and offices, what will happen to the value of commercial real estate? This question came to me most recently near Oakland when I saw a truck (labeled something Van.Com) drive up to a house. Two energetic young men jumped out, went to the rear of the truck and carried two crates of groceries to the front door. I found out that if you order more than $50 worth, they .