The blaze started on the 6th floor of the 27-storey building owned by the Ambanis on Altamount Road at around 9.10 pm, the Disaster Control Room of the Brihanmumbai Municipal Corporation (BMC) said.
On getting information, half a dozen fire tenders were rushed to douse the flames, a civic official said.
Mumbai Police's PRO Rashmi Karandikar said police and fire brigade teams were at the spot and the situation was under control.
Further details are awaited.
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