The accident took place in Chandni Mahal area near Jama Masjid around 8 p.m. The Katra Data Ram ki Haveli was one of the old heritage buildings in the Walled City.
http://ummid.com/news/2011/September/28.09.2011/delhi_bldg_collpase.htm
http://ummid.com/news/2011/September/28.09.2011/delhi_bldg_collpase.htm