The 1870s provided several massive projects which made the green a central meeting point and prestige address that formalized the use of the square. Land acquisition began in 1872 and the park took its present form in 1878. Simultaneously, the Catholic Archdiocese began construction of Mary, Queen of the World Cathedral across from the southeast corner of the square. On the western side of the square, the Windsor Hotel was completed by 1878. With such prestigious construction and massive human traffic, the square became a vital component of the urban environment and a focal point for transit between the office and commercial sectors and the retail and suburban sectors. In 1889, the Canadian Pacific Railway constructed Windsor Station on the south side of De la Gauchetière Street, opposite St. George's Cathedral. This further increased the importance of the square as a major focal point. Later construction would involve the demolition of the original YMCA Building (1851) on the east side of the square in order to allow the construction of the first portion of the Sun Life Building at the corner of Metcalfe Street and Dorchester Boulevard, which would grow to take up the entire eastern side of the square by 1931. In 1929, the northern side of the square was graced with the Dominion Square Building, designed as an integrated shopping arcade and office tower. The arcade was specifically designed to draw pedestrian traffic between the square and St. Catherine St.. Additional construction after the Second World War saw the development of the Laurentian Hotel across from the southwest corner of the square. In 1960, the original southern section of the Windsor Hotel was demolished in order to build the CIBC Tower. The 1960s also saw major developments as Dominion Square became the central orienting point for the new downtown of modernist skyscrapers. As such, a skywalk was erected on the south side of the square, across De la Gauchetière to Place du Canada and the Chateau Champlain hotel. In 1967, Dominion Square was divided into two parts, the southern portion being renamed Place du Canada while the northern portion retained the name Dominion Square. After the death of René Lévesque in 1987, Dorchester Boulevard was renamed in his honour and Dominion Square was renamed "Dorchester Square", after Guy Carleton, 1st Baron Dorchester, who supported the rights of French speakers in British North America. There are four principal monuments in Dorchester Square, originally arranged to form an equilateral cross with the 'Camellienne' (a multi-purpose kiosk that currently houses a snack bar) at the northern point.