The mother-son duo had to be taken out through the staircase as the specialised 'snorkel ladders' of the Fire Brigade could not reach up to the spot where they were stranded.
The fire started in the 12th floor duplex flat in Gulmohar Society at around 5.30 am, probably because of a short circuit, Fire Brigade sources said.
Shivajirao Chougule (84) and his wife Nirmala Chougule (78), who were asleep, could not escape in time and died.
The Fire Brigade's truck-mounted ladder could not be manoeuvred properly because of the cars parked in the parking lot and the surrounding trees, and could not reach the spot.
Finally, six firemen entered the flat through stairs and rescued them. Both were admitted to a private hospital.