In West Bengal, joint-sector firms have been formed to provide low-cost housing for middle- and lowincome groups. The cross-subsidy model lets developers set prices for higher-income groups, while middleincome groups get houses at cost price and lower-income groups below that. A Mumbai-based group is investing about Rs 1,500 crore on a project in east Kolkata, which will have 20,000 units priced from Rs 3-6 lakh for lower- and middle-income groups. Kolkata's Shrachi Group is developing Greenwood Nook, also in the east. The 284-unit estate will accommodate all income groups.