Capital gains rollover relief: purchase or construction of a residential house within prescribed periods preserves exemption. Amendment confines section 54 relief to transfers by individuals of buildings or lands appurtenant thereto that are long-term capital assets and residential houses chargeable under 'Income from house property,' requires purchase within one year before or after transfer or construction within the post-transfer period to qualify, substitutes 'residential house' for 'house property,' defines long-term capital asset as not short-term, and extends the construction timeframe in the related sub-section.