New Delhi, July 03: State-owned National Building Construction Corporation (NBCC) has been awarded the work for construction of patent office complex in four metro cities - Delhi, Kolkata, Chennai and Mumbai - at a total cost of Rs 45 crore. NBCC has also been entrusted by the urban development ministry with construction projects costing over Rs 90 crore during the current year in three Northeastern states, an official release said here today. Bureau Report