S. 11 : Property held for charitable purposes-Lease rent-Lessee companies were part of same group where trustees of assessee-trust and their relatives held more than 50 per cent of shares, tenants of rented property-Section 13(3) and as provisions of section 13(1)(c) read with section 13(1)(b) were violated-Assessee is not entitled to claim exemption under section 11. [S. 12AA, 13(1)(b), 13(1(c), 13(3)]