S. 263 : Commissioner-Revision of orders prejudicial to revenue-Depreciation-Lease hold improvements at its leasehold office premises-100 percent deprecaiation-Temporary erection-Assessing Officer had not examined nor applied his mind in respect of available rate of depreciation on leasehold improvements, granting said depreciation was erroneous prejudicial to interest of revenue-.Order of Tribunal affirmed. [S. 32, 260A]