Travertine tiles covering surfaces of the whole station, spanning over . Other work included replacing the lighting system, fixing columns, beams, and concrete slabs and replacing granite staircases and handrails. The work was to be completed by March 2013. More recently (end of 2016), modernized signage has been put in place, flooring has been completely replaced and the stained glass installation underwent a restoration and was put back in place. In 2020, work began on making the station universally accessible, ahead of the arrival of the REM. The project involves the construction of a new entrance building, two elevators and refurbishment of three of the other entrances. Réseau express métropolitain station In November 2016, CDPQ Infra announced that the proposed Réseau express métropolitain (REM) system would connect to the Green line at McGill. As with the 1980s Line 3 proposal, the REM will use the historic Mont Royal tunnel to head north from downtown. The REM station will be located under McGill College Avenue, and a pedestrian tunnel will connect it to the Green Line station concourse, as well as the wider Underground City. CDPQ Infra indicate that the station will be the 2nd busiest station on the REM, with over 25,000 passengers per day. Construction on the McGill REM station began in September 2018. In this location, the Mont Royal tunnel is not bored through solid rock, and therefore work to strengthen the historic tunnel was required. , the REM station is planned to open at the end of 2024. Entrances The station has 6 entrances: 690, De Maisonneuve Ouest 640, De Maisonneuve Ouest 811, De Maisonneuve Ouest 2055, Boulevard Robert-Bourassa 2021, Avenue Union 1445, Av. Union and La Baie Architecture and art This station contains several pieces of artwork. The most prominent is Nicolas Sollogoub's Montreal Scenes Circa 1830, depicting the industrial era in the city as well as its early mayors and civic arms. This set of five stained-glass murals was donated by Macdonald Tobacco, and installed in 1974. Maurice Savoie created a set of terra cotta murals depicting fruit and flowers, surrounding the entrance to Eaton's (now the Complexe Les Ailes). This were installed when the station opened in 1966. The construction of the Promenades de la Cathédrale in 1992 brought two new works of art, a light sculpture called Passūs by Murray MacDonald, and an installation of an aerial view of Montreal complete with miniature