Return filing for Flat Owner.

Nilotpal (Student) (31 Points)

19 July 2016  
According to proviso to section 139(1) of Income Tax Act, it is obligatory to file Income Tax Return even when the total income is below the taxable limit when assessee possess a specified floor area of immovable property in his own name during the Assessment Year.
What is the specified floor area for the purpose of proviso to sec.139(1) in Serampore city, Hooghly district, West Bengal ?
Is it necessary to file return in case a person possess a flat of lower area ?