A portion of this building had come down a couple of days ago following which fire officials evacuated the occupants.
The city received a total of 139 mm rainfall till 6am since on Sunday, throwing normal life out of gear, Disaster Control officer Santosh Kadam said.
Also, there were two incidents of wall and slab crash on a drain due to incessant showers in the town.
Continuous rains and flash floods cut-off some remote areas in the district, leaving thousands marooned.
Reports reaching district headquarters said the river at Maswan in Manor (Palghar) was overflowing as a result of which the bridge was totally submerged under water.