Cimmerial property loan

There is no tax benefit for the purchase of commercial property u/s 80C of the principal amount. 

Only the interest component paid for the loan EMI can be taken as a deduction u/s 24 without any limit. Further from FY 17-18, the maximum loss for Income from House Property if any after deduction of interest is capped at Rs 2 lakhs annually

As per Sec 57(iii) deduction allowed from other sources income is" Any other expenditure (not being capital expenditure) expended wholly and exclusively for earning such income"