Question of deductibility of an expenditure u/s. 57(iii) of

I am pensioner and owner of flat in Coop. Housing Society in Pune and now building is demolished by builder/ developer for redevelopment. I am receiving Rs.20000/- p.m. rent compensation from Builder. Whether I should show it in other income under Sec 56 and show deduction under Sec 57. Or should I claim only 30% of Rent received for deduction like HRA.