"...... The Revenue had argued that clause (d) inserted with effect from 01.04.2005 should be applied retrospectively, which argument was repelled by the High Court. Therefore, for better understanding, we would like to begin our discussion with the meaning given to 'housing project' along with the issue of retrospectivity of clause (d), as raised by the Revenue, which was dealt with by the High Court and repelled. That portion of the discussion contained in the High Court judgment, which has some bearing on the issue at hand, runs as under: "21. Thus, on the date on which the legislature introduced 100% deduction under the Income Tax Act, 1961 on the profits derived from housing projects approved by a local authority, it was known that the local authorities could approve the projects as houding projects with commercial user to the extent permitted under the DC Rules framed by the respective local authority. In other words, it was known that the local authorities could approve a housing project without or with commercial user to the extent permitted under the Development Control Rules. If the legislature intended to restrict the benefit of deduction only to the projects approved exclusively for residential purposes, then it would have stated so. However, the legislature has provided that Section 80IB(10) deduction is available to all the housing projects approved by a local authority. Since the local authorities could approve a project to be a housing