Mumbai was the first Indian city to introduce free in-situ housing for slum residents in 1998.
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/%E2%80%98housing-all%E2%80%99-mission-new-slum-rehab-policy-take-tips-gujarat-mumbai-models
[2] http://admin.indiaenvironmentportal.org.in/category/author/shalini-nair
[3] http://admin.indiaenvironmentportal.org.in/category/newspaper/indian-express-new-delhi
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/housing
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/gujarat
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/mumbai
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/slums
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/rehabilitation
[9] http://admin.indiaenvironmentportal.org.in/category/thesaurus/ministry-housing-and-urban-poverty-alleviation
[10] http://admin.indiaenvironmentportal.org.in/category/thesaurus/floor-space-index-fsi
[11] http://admin.indiaenvironmentportal.org.in/category/thesaurus/habitat-and-urbanisation