This design for a new 44-storey tower at 880 Bay Street, within the Queen’s Park government precinct, is a substantial new addition to the provincial government’s Toronto Accommodation Plan. Each facade of the tower is unique in order to achieve optimal solar orientation as part of an overall sustainability strategy targeting a minimum of LEED Gold. Daylight harvesting occurs on the south face through light shelves inside and brise-soleils outside, with clear glass on the north face to maximize natural daylight. Vertical fins reflect light on the east facade, and fritted glass is placed on the west facade to screen the offices from solar gain. The building’s long, thin form creates narrow floor plates that optimize natural light penetration. At street level, the building base relates to the scale of the adjacent two-storey arches of the existing Queen’s Park complex, improving the experience of a seamless pedestrian precinct within the urban fabric of downtown Toronto.