Section 5(1)(iii) in The Land Acquisition (Companies) Rules, 1963
(iii)that where the appropriate Government is satisfied after such enquiry as it may deem necessary that the company was prevented by reasons beyond its control from erecting, providing, constructing or executing dwelling houses or amenities or any building or work within the time specified in the agreement, the appropriate Government may extend the time for that purpose by a period not exceeding one year at a time so however that the total period of extension shall not exceed three years;