Quick Quiz: You've just built and leased 50,000 square feet of office space in a superbly insulated, modern building, which you've finished with three coats of paint, wall-to-wall carpeting, and fireretardant draperies. A month later, you get a call from your tenant saying that 35 of his 80 employees are complaining about headaches, sore throats, loss of appetite, and problems concentrating on their work. He wants you to replace certain building materials and redesign your hvac system (your ventilation system's air intake, it turns out, is right above the loading dock), and to show his sincerity he threatens to sue you for negligence for exposing him to known carcinogens and other dangerous compounds. Does he have a case?