The central probe agency said it issued a provisional order on November 14, under the Prevention of Money Laundering Act (PMLA), attaching six shops/commercial premises and three residential flats "belonging to Chandrakant Patel and others in the matter of Ms Pushpak Bullion in post demonetisation currency conversion scam in Mumbai".
The assets are worth Rs 21.46 crore, it said.
The Enforcement Directorate (ED) had arrested Patel in this case in September and he is in jail currently.
"The account of Ms Pushpak Bullion was already a NPA (non performing asset) account declared by the concerned bank," the agency said in a statement.
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The agency had called Patel as the mastermind in this money laundering scam.
It had said that its probe found that cash to the tune of Rs 84.5 crore was deposited in the account of companies--M/s Pihu Gold and M/s Satnam Jewels--post notes ban.
The agency had said its investigation showed that the said companies did not have matching economic wherewithal to have entered into such transactions in cash and subsequently layering the same through investments in gold bullion.
The two currencies of Rs 500 and Rs 1000 were demonetised after a declaration by Prime Minister Narendra Modi on November 8 last year.