Castleforge said the city has 'great potential to grow as a world-leading international business hub': Castleforge said the city has 'great potential to grow as a world-leading international business hub' Property investment firm Castleforge has acquired a large corporate office building in the centre of Manchester. The real estate firm announced the purchase of Linley House on Friday, with the 68,000sq ft Dickinson Street site estimated to hold a gross development value of over £30m.