During the last ten years, several high rise office buildings were built, particularly in the northern and eastern parts of the city. Additionally, a trend to add modern wings and façades to historic buildings has occurred, the most prominent example of which is the Bucharest Architects' Association Building, which is a modern glass-and-steel construction built inside a historic stone façade. In 2013, the Bucharest skyline enriched with a 137-m-high office building (SkyTower of Floreasca City Centre), the tallest building in Romania. Examples of modern skyscrapers built in the 21st century include Bucharest Tower Centre, Euro Tower, Nusco Tower, Cathedral Plaza, City Gate Towers, Rin Grand Hotel, Premium Plaza,