Emergency workers from the National Disaster Response Force (NDRF) have so far pulled 20 survivors from the rubble of the three-storey building in Bhiwandi, near Mumbai.
An NDRF spokesman and local authorities told reporters that recovery teams, aided by sniffer dogs, retrieved 35 bodies buried under brick and concrete after the block came crashing down before dawn on Monday.
An official with Thane city authorities, which oversees Bhiwandi, said the dead included eight children.
The cause of the incident was not immediately clear, but building collapses are common during India's June-September monsoon season, with old and rickety structures buckling under days of non-stop rain.
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