Mossimo's former landlord has filed a lawsuit against the troubled designer, saying that the company has reneged on its contract.The lawsuit, which was filed recently in Orange County Superior Court, says that Mossimo reneged on the contract when it stopped making payments on the warehouse it was leasing from Irvine Co. Irvine Co wants around $4.5m in unpaid and future rent, plus other expenses.Jody Love, vice president of finance for Mossimo, declined to comment about the lawsuit or the move.