Government officials said the plots stretching over approximately 50 acres in different parts of the city had been allotted to the private players over 44 years ago.
"Construction on the plots was supposed to start in three years of allotment. However, no construction has been carried out so far. The Delhi Development Authority (DDA) is supposed to cancel the allotment if the construction is not carried out in the stipulated period," a government official said.
Also, the official said that the state government had written to the DDA twice about revoking the 18 allotments made to parties.