Beginning with the American designed art deco church at Turner's Cross in 1927, Irish architecture followed the international trend towards modern and sleek building styles since the 20th century. Other developments include the regeneration of Ballymun and an urban extension of Dublin at Adamstown. Since the establishment of the Dublin Docklands Development Authority in 1997, the Dublin Docklands area underwent large-scale redevelopment, which included the construction of the Convention Centre Dublin and Grand Canal Theatre. Completed in 2008, the Elysian tower in Cork is the tallest storeyed building in the Republic of Ireland (the Obel Tower in Belfast, Northern Ireland being the tallest in Ireland), at a height of , surpassing Cork County Hall. The Royal Institute of the Architects of Ireland regulates the practice of architecture in the state.