The Tamil Nadu Government will implement a massive housing scheme at an estimated cost of Rs. 3200 crore under the Jawaharlal Nehru National Urban Renewal Mission to make Chennai, Madurai and Coimbatore slum-free cities. Work on the project will commence in 2007 and it will be completed in seven years, Housing and Slum Clearance Minister Suba Thangavelan told the Assembly on Friday. The Centre and the State would the project cost equally.