Deduction under section 80-IB updated: extended completion timeframe and revised commercial area limits for housing projects. Section 80-IB is amended to extend the completion period for housing projects approved on or after the specified approval date, increasing the allowed time to complete such projects to preserve eligibility for the deduction. The amendment also revises the limit on non-residential built-up area within qualifying housing projects by substituting the existing proportional cap and square-foot alternative with a lower proportional ceiling and a higher square-foot threshold. These changes are stated to operate retrospectively for the specified assessment year and thereafter.