A single lawsuit filed against GMAC Commercial Mortgage regarding forced-placed terrorism insurance on a property included in one of its commercial MBS pools has turned into a class action which could cost GMACCM more than $400,000. GMAC Commercial is appealing the class action status. The original lawsuit, filed in the fall of 2002, alleged that GMAC Commercial force-placed terrorism insurance on a CMBS property in Dallas at a cost of nearly $2,500. The single suit…