Question: Where are Grenfell Centre and Telstra House both located?

Context paragraphs:
Telstra Corporate Centre: Telstra Corporate Centre is an office skyscraper in Melbourne, Australia.  Standing 218 m high with 47 floors (43 used as offices), it is in the top ten tallest in Melbourne.  It is located at 242 Exhibition Street.  It is the world headquarters for Telstra and includes a small retail precinct located on the ground floor towards the Little Lonsdale St side.

Elmdon Heath: Elmdon Heath is an area of Solihull, West Midlands, United Kingdom.  It is located to the north of the town centre, at a distance of approximately one mile.  It is primarily residential, though there are a few shops, a garage, a community centre a secondary school, a primary school and a church centre.  The area is centred on the Damson Lane thoroughfare and the Greville Arms public house.  In addition to this there is a further pub at the Red House.  Elmdon Heath is on the edge of the West Midlands conurbation and bordered by the Land Rover factory, Solihull town centre, the residential area of Damsonwood and open countryside.  The housing was largely constructed between the 1930s and 1950s, though infill development continues apace.  Much of the residential land was previously farmland until it was commandeered during World War Two.  The former church of St. Francis of Assisi, which was located on Cornyx Lane, closed when the rector was relocated and no substitute was offered.  It was vandalised repeatedly, ending in it burning down and has been demolished, the land under residential development.

Hindmarsh Square: Hindmarsh Square is a public square in Adelaide, South Australia.  It is located in the centre of the north-eastern quarter of the city, and surrounds the intersection of Grenfell and Pulteney Streets, near the eastern end of the Rundle Mall.  Pirie Street forms the southern boundary of the square.  It was named by the Street Naming Committee after John Hindmarsh, the first Governor of South Australia.

Pentagon Shopping Centre: The Pentagon Shopping Centre (known locally as 'The Pentagon') is a shopping centre in Chatham in Kent.  The shopping centre is located next to the Waterfront bus station which replaces the Pentagon bus station, which 80% of services use.  The shopping centre contains over 70 shops and 7 leisure facilities, many high street names in fashion, homeware and food stores.  There are also cafes, restaurants and a bowling alley.  As is common with some other 1970's era town centre shopping centres, The Pentagon does not feature a food court or any dedicated dining area.  Instead, there are various food outlets scattered throughout the centre.  Built as part of the redevelopment of Chatham town centre in the 1970s, the Pentagon also features the high rise Mountbatten House office block, which has controversially stood empty or part-used for most of its history.  The Pentagon, Mountbatten House and the Brook multi-storey carpark are built in a distinctive orange-red brick with grey concrete.

City Cross Arcade: City Cross Arcade is a two-level shopping complex located on 32 Grenfell Street Adelaide South Australia with entrances to Rundle Mall, Grenfell Street, James Place and Gawler Place.  The centre is owned by the Makris Group, who purchased the site in 2001 after it was placed up for sale by the previous owners, Hawaiian Investments, in 2000.  The main two anchors are Harvey Norman and Amart Sports.  The complex also features smaller retailers and a large food court including KFC, Hungry Jack's, Subway, Oporto, Sumo Salad, Charlesworth Nuts, Bean Bar and many other food outlets.  Amongst the smaller stores are Swiss Glory chocolates and, at one time, Quality 5 Crafts.  Australia Post Adelaide Rundle Mall Post Shop is also located on the first floor.

Grenfell Centre: Grenfell Centre, also known as The Black Stump, is a high rise office building and is the third tallest building in Adelaide, 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 comprises 26 floors and was completed in 1973.  In the 1980s, the building's foyer and interior were refurbished.  A ten meter antenna was attached in 1980 and upgraded with digital transmitters in 2003, increasing the height a meter further.

Centre Hill Historic District: Centre Hill Historic District is a national historic district located at Petersburg, Virginia.  The district includes 81 contributing buildings located in a predominantly residential section of Petersburg.  It includes a varied collection of early-19th-century to early-20th century houses and includes notable examples of Greek Revival, Italianate, Colonial Revival, and Bungalow style architecture.  Notable buildings include the Centre Hill Apartment Building (1915), Eichberg House, Powell House, Unger House, and St. Joseph's Convent.  Located in the district and separately listed is the Centre Hill Museum.

Abbot House, Dunfermline: Abbot House is a heritage centre located on the Maygate in Dunfermline, Fife, Scotland.  It lies in the shadow of Dunfermline's great abbey church.  Located in a building with a 16th-century core, Abbot House offers a view of Scotland's history from early beginnings through the 19th century, provided to visitors by guided tour.  The heritage centre closed in August 2015 after attempts, by Abbot House Heritage Centre Trust, to find alternative funding for the centre failed.

Perth International Telecommunications Centre: The Perth International Telecommunications Centre (PITC) is located in the northeastern Perth suburb of Cullacabardee, and has handled a large percentage of Australian telecommunications company Telstra's satellite communications since its opening in November 1986.  Most government agencies refer to the site's location as Landsdale or Landsdale-Gnangara.

Telstra House: The Telstra House is a skyscraper/high-rise building that is located in the Adelaide CBD on the northern side of Pirie Street.  The Telstra House rises 104 metres above the ground and has 24 floors.

Supporting paragraphs: Grenfell Centre Telstra House
Answer: Adelaide, Australia