In 1951 the college purchased the freeholds to 85 and 87 Banbury Road and 9 to 13 Canterbury Road from St John's College. In addition, the freehold of The Shrubbery was acquired; this meant the college now owned the freehold of the entire fourteen and a half acre site. The college extended the Main Building in 1958. The 1960s saw an extensive programme of building work at St Hugh's. The Shrubbery was converted into the Principal's Lodgings in 1963. Between 1964 and 1965 the Kenyon Building was constructed to provide accommodation for students (designed by modern architect David Roberts, the building has already been given a heritage listing). This was followed shortly after by the Wolfson Building, which was constructed between 1966 and 1967 and opened by Princess Alexandra and Harold Macmillan in his role as Chancellor of the University. The Chapel was renovated in 1980; a new organ was installed. The following year, 78, 80 and 82 Woodstock Road were also renovated. The houses are now named SH Ho House, Ho Tim House and KK Leung House in recognition of the gifts from the three Hong Kong benefactors that funded the renovations. A new boathouse was constructed (jointly with St Anne's and Wadham Colleges) between 1989 and 1990. This was followed by the construction of the Rachel Trickett Building between 1991 and 1992 at a cost of £3.4 million. Between 1998 and 2000 the Maplethorpe Building was constructed; the building contains conference facilities on the ground floor and student accommodation on the upper three floors. The building missed its planned opening date of summer 2000, meaning students had to be accommodated in B&Bs throughout Michaelmas term. In addition, a new main entrance was constructed at the back of the college on Canterbury Road. Between 1999 and 2000 the library was extensively renovated. It was reopened by Betty Boothroyd and was renamed after Howard Piper, a Maths student of the college who died shortly after graduating in a rafting accident. A major refurbishment of Mordan Hall, the old library, took place in 2007. There are statues of both St Hugh and Elizabeth Wordsworth on the library stairs. These were presented to the college as gifts for its Jubilee in 1936. St Hugh carries a model of Lincoln Cathedral, which would have been very familiar to Elizabeth Wordsworth, and has his other hand resting on the head of a swan, probably the famous swan of Stow, although the swan is also a symbol of purity. Elizabeth Wordsworth is depicted wearing her doctoral robes.