The fire brigade has confirmed that the blaze has been doused.
BMC Disaster Control official T. Jankar said the fire brigade and other resources were immediately mobilised and the fire was extinguished after about 16 minutes, with no reports of any casualties.
"The fire was confined to the 4G antenna, plastic framing of vertical garden, etc on the ninth floor," Ghadigaonkar said.
There were no casualties in the incident. The building stands over 170 metres tall.
Taking no chances, the fire brigade rushed three fire engines, three jumbo water tankers, one turn-table ladder and high-pressure pump to combat the conflagration.
A Reliance Industries Ltd. official spokesperson, confirming the fire, said that at the time of the incident the Ambani family members were not in the building.
In a media statement, the company spokesperson said: "There was a small fire in the garden area of Antillia this evening which was quickly brought under control. No one was injured. The cause of fire is being investigated."
The 27-storey Antilia has been described by billionaire industrialist Mukesh Ambani's wife Nita as a "modern home with an Indian heart" and the "only home we have in the world."
6 vehicles of fire brigade rushed to the ultra-luxurious 400,000 sq feet Ambani mansion. More details awaited.
(This story has not been edited by NDTV staff and is auto-generated from a syndicated feed.)