S.54F : Capital gains-Investment in a residential house-Monthly tenancy-Owner entering into development agreement –Development of building-Two flats in new building is allotted to assessee and spouse-Market value as consideration-Relinquishment of tenancy rights in lieu of allotment of new flat-Entitle to exemption –Power of Tribunal-Death of the assessee during pendency of appeal-Tribunal has the power to decide the appeal on the relevant material [S. 45, 254(1), ITAT R.1963, R.26]