pubs, restaurants, clubs, local retail shops, and two large Apex Hotels. The building dates range from 17th century to 21st century. The White Hart Inn dates from the early 18th Century and claims to be the oldest public house in Edinburgh and is said to have been visited by Robert Burns (1759–96), the Wordsworths (1803), William Burke and William Hare in the late 1820s. The City Improvement Scheme of 1868 cleared many of the slums and widened streets such as West Port, and the western group of buildings all derive from this plan. A further improvement plan in the 1920s by the City architect Ebenezer MacRae skilfully closed many of the gaps with faux Scots Baronial blocks, ironically all built as council housing. There are several modern buildings on its southern side. Some properties were used by Heriot-Watt University, and its predecessor college, for teaching and research until the university moved fully to its new Riccarton campus (1974–92). The Mountbatten Building of Heriot-Watt University was built in 1968) for the departments of electrical engineering, management and languages. The Mountbatten building was converted and reopened as the Apex International Hotel in 1996. An example of 21st century architecture is Dance Base (2001) by Malcolm Fraser Architects, the Scottish National Centre for Dance, which runs back from a traditional frontage to a multi-level design on the slopes of the Castle Rock; the design won a Civic Trust Award and Scottish Design Award in 2002. Modern developments For most of its history the Grassmarket was one of the poorest areas of the city, associated in the nineteenth century with an influx of poor Irish and the infamous murderers Burke and Hare. Up until quite recently it was still to some extent associated with homelessness and drunkenness before its rapid gentrification as a popular tourist spot. The character of the area was reflected in a number of hostels for the homeless, including that of the Salvation Army Women's Hostel (now a backpackers hostel) which existed here until the 1980s. From then on property prices started to rise sharply. The area is, and always has been, dominated by a series of public houses. In recent years many have become more family-friendly and include dining areas. The council has recently further encouraged these to spill over onto outside pavements, giving the place a more Continental atmosphere. The Grassmarket was subject to a streetscape improvement scheme carried