NEW DELHI, Oct. 14 -- The Municipal Corporation of Delhi (MCD) has surveyed nearly 400,000 properties across the national capital and identified around 21,000 residential buildings operating commercial establishments, people familiar with the matter said on Wednesday.

"Around 5% of the surveyed properties were found to be in violation of the norms. They are designated for residential use but are being used for commercial activities. We will issue notices and initiate sealing proceedings in a phased manner," a senior MCD official said.

The survey in Delhi has identified coaching centres, restaurants, grocery stores, sweet shops, and other commercial establishments operating from residential premises.

The exercise follows a Supreme Court...