Six fire tenders and five water tankers have been pressed into service to douse the flames, said the official.
R K Studio houses the logistics of the R K Films production company, both established by and named after Bollywood actor Raj Kapoor.
P S Rahangdale, the chief of the Mumbai fire brigade, said an alert call was received by the department around 2.22 pm and fire fighters reached the spot within five minutes.
"The fire was confined to electric wiring, electric installation, decoration equipment in the 100x80 sq ft area on the ground floor of the building," he said.
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