Greenstone Building, Commercial building in Yellowknife, Canada

The Greenstone Building is a four-storey stone-faced federal office building on Franklin (50th) Avenue in downtown Yellowknife. Two flat-roofed sections with green roofs join at the northwest corner, where a curved entrance portico sits; a 48-metre curved glass curtain wall with photovoltaic cells spans the rear between two stair towers. It houses 16 federal agencies.

The building was completed in 2005 and marked a turning point in commercial development for the Northwest Territories. This construction showed the region's commitment to building modern business infrastructure.

The name comes from greenstone, the local rock from which Yellowknife's gold was extracted. Inside, the stair tower is clad in slanted boards recalling the mineshaft towers still standing around the city, and the trace of a fault beneath the building is marked on the lobby floor. Sixteen federal agencies occupy the offices.

The building sits in the heart of Yellowknife and is easy to find and walk to from nearby areas. The spaces are designed for business use and operate during standard business hours.

The building was specially designed to handle extreme weather conditions and the short days of the north. Its architecture shows practical solutions needed in this Arctic region.