New Delhi, Jun 10 (PTI): The two additional floors allegedly being constructed illegally on a building in Saidulajab that collapsed last month in south Delhi, killing six people, were part of a contract worth around Rs 1.8 crore, investigators have found, officials said on Wednesday.Delhi Police has already arrested the building owner, Karamveer, and two contractors, Manish Khatri and Avinesh Gupta, in connection with the May 30 collapse in sout…