Scarborough Centre is situated in the master planned city centre district of Scarborough, immediately south of Scarborough Town Centre Mall, north of Borough Drive and approximately 400 m west of McCowan Road. Primary trip attractors include the mall, Scarborough Civic Centre (formerly Scarborough's city hall before amalgamation with Toronto), and major bus terminals for the TTC, GO Transit, and intercity carriers.
Scarborough Centre is easily the most important station on Line 3 besides Kennedy: of the 35,000 daily weekday trips on Line 3 in 2018, over 23,000 began or ended at this station. This is hardly surprising, as the station functions as the primary rapid transit gateway to northern and eastern Scarborough, Durham Region, and even destinations as far away as Ottawa and Montréal.
The station is arranged on three levels. Line 3 trains stop on the highest level, elevated above grade. As with all Line 3 stations, Scarborough Centre features two side platforms, signed as "Westbound to Kennedy via Ellesmere" and "Eastbound to McCowan" (compass designations vary by station on Line 3). Although the station is enclosed, each platform includes a small internal shelter at the west end to act as a windbreak, particularly in harsh winter weather. Both platforms connect to the main concourse one level below via stairs, escalators, and elevators. The concourse is also built above grade, and spans the length of the station, featuring two exits at the east and west ends. The eastern exit is by far the busiest, as it connects to a skywalk between Scarborough Town Centre Mall, the plaza of Scarborough Civic Centre, and the regional bus terminal opposite the TTC entrance. The quieter western entrance lets out onto a privately owned public plaza serving multiple high-rise condo towers, and eventually leading to Borough Drive.
Below the concourse, partially sunken below grade is the bus terminal, connected by stairs, elevators, and escalators. Below the skywalk at the eastern entrance one level above, the bus terminal is partitioned into east and west halves. The western half of the terminal serves TTC routes within the fare paid zone. Under the skywalk, a small indoor area contains a fare line and mechanical spaces, linking directly to the east end of the terminal, which serves regional and intercity carriers. The terminal is maintained by the TTC, and the stairs leading down from the skywalk to the regional terminal bear TTC asset IDs.
Scarborough Centre opened in 1985 and its design aesthetic, consistent with the rest of Line 3, is a product of its time. The platforms are enclosed by a flattened arch roof supported by steel bents. The flat portion of the roof, above the tracks, is solid, with the walls and curved upper corners composed of blue glazed glass and bare aluminum mullions. Unlike the bare or painted concrete walls and floors typical of most other Line 3 stations, many of the walls at Scarborough Centre are tiled with circular yellow tiles in a honeycomb arrangement, and the platform and Concourse floors are also tiled.