Blackstone Group LP was sued over its 2007 sale of Extended Stay Inc., which left the hotel company insolvent and drove it into bankruptcy, a trust for Extended Stay creditors said. Blackstone "siphoned" $2.1 billion from the company as part of the leveraged buyout without regard for how it would perform following the deal, the creditor trust said in lawsuits filed yesterday in U.S. Bankruptcy Court in Manhattan and New York State Supreme Court. Blackstone called the suits meritless.