Grenfell Centre, also known as The Black Stump, is a high rise office building located at 25 Grenfell Street in the Adelaide city centre. It is the seventh tallest building in Adelaide, South Australia, with a height of 103 metres (338 feet). It was the tallest building in the city until surpassed by the Telstra House in 1987. It has 26 floors and was completed in 1973. In the 1980s, the building's foyer and interior were refurbished. A ten-metre antenna was attached in 1980 and upgraded with digital transmitters in 2003, increasing the height a metre further.