Two notable buildings from this time are the Crețulescu Palace, housing cultural institutions including UNESCO's European Centre for Higher Education, and the Cotroceni Palace, the residence of the Romanian President. Many large-scale constructions such as the Gara de Nord, the busiest railway station in the city, National Bank of Romania's headquarters, and the Telephone Palace date from these times. In the 2000s, historic buildings in the city centre underwent restoration. In some residential areas of the city, particularly in high-income central and northern districts, turn-of-the-20th-century villas were mostly restored beginning in the late 1990s.