He said that an unauthorised construction, measuring 400 feet by 25 feet, erected in compulsory open space outside the hall of the club was demolished yesterday.
"After we received a complaint, our team noticed certain irregularities and found that the complaint was true," the official said.
He added that the club had been issued two notices, the last one being in October, but it had failed to give a satisfactory reply after which it was demolished.
Gupta, who is also general secretary of Mumbai BJP, said, "I raised this issue two years ago but action came so late. Its better late than never. Municipal officials did not act against the club because they were given honorary memberships."
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Gupta alleged that the club had violated Coastal Regulation Zone norms and provisions of the Maharashtra Regional and Town Planning Act and demanded that its office bearers be booked.
The NSCI was first set up in Delhi under the patronage of Pandit Jawaharlal Nehru, Dr Rajendra Prasad and Sardar Patel among others and the second club was set up in Mumbai's Worli area in 1950.