Question: Where is the head office of the company that Archibald McDonald was Chief Trader for?

Context paragraphs:
Jean Baptiste Lolo: Jean Baptiste Lolo (born 1798, date of death unknown), also known as St. Paul or Chief St. Paul, or Chief Lolo, was an employee and interpreter with the Hudson's Bay Company in pre-Confederation British Columbia, Canada.  First serving in the region at Fort Fraser in the New Caledonia fur district, he acquired the nickname there of St. Paul because of his affection for that saint.  He was the right-hand man of John Tod and followed him to Fort Kamloops, where Tod was Chief Trader from 1841 to 1843, and remained in that region for the rest of his life.  He acquired such great respect among the local Secwepemc (Shuswap) people as to become regarded as a chief.

James McMillan (fur trader): James McMillan (1783–1858) was a fur trader and explorer for the North West Company and Hudson's Bay Company.  He led some of the earliest surveys of the lower Fraser River and founded Fort Langley for the HBC in 1827, and was its first Chief Trader.

Tshimakain Mission: The Tshimakain Mission started on August 29, 1838, with the arrival of Presbyterian missionaries Cushing and Myra Fairbanks Eells and Elkanah and Mary Richardson Walker to the area along Chamokane Creek at the community of Ford, Washington.  Fort Colvile Chief Factor Archibald McDonald recommended the area to Eells and Walker on their first visit to the area.  On April 23, 1838 after traveling to Independence, Missouri, the Eells, Walkers, William Henry and Mary Augusta Gray, Asa B. and Sarah Smith, and Andrew Rodgers, departed for the Oregon County with a Hudson Bay Company fur trader caravan to the Rendezvous.  They arrived at Waiilatpu and the Whitman Mission on August 29, 1838.

John Archibald McDonald: John Archibald McDonald (February 25, 1851 – February 17, 1925) was a lawyer and political figure in Nova Scotia, Canada.  He represented Victoria in the Canadian House of Commons from 1887 to 1896 as a Conservative, then Liberal and finally Conservative member.

John Archibald McDonald (Saskatchewan politician): John Archibald McDonald (August 1865 – 1929) was a banker and political figure in Saskatchewan, Canada.  He represented North Qu'Appelle in the Legislative Assembly of Saskatchewan from 1908 to 1914 as a Provincial Rights and then Conservative member.

Archibald McDonald: Archibald McDonald (3 February 1790 – 15 January 1853) was Chief Trader for the Hudson's Bay Company at Fort Langley, Fort Nisqually and Fort Colvile and one-time deputy governor of the Red River Colony.

John McDonald (English cricketer): John Archibald McDonald (29 May 1882 – 4 June 1961) was an English cricketer who played first-class cricket for Derbyshire in 1905 and 1906.

Samuel Black: Samuel Black (May 3, 1780 – February 8, 1841) British fur trader and explorer, Clerk in the New North Nest Company (XYC) and Wintering Partner in the North West Company (NWC), and later Clerk, Chief Trader, and Chief factor in the Hudson's Bay Company (HBC) for the Columbia District.  In 1824, he explored the Finlay River and its tributaries in present-day north-central British Columbia, including the Muskwa, Omineca and Stikine for the HBC, his journals later published by the Hudson's Bay Record Society in 1955.

Hudson's Bay Company: The Hudson's Bay Company (HBC; French: "Compagnie de la Baie d'Hudson" ), commonly referred to as The Bay (La Baie in French), is a Canadian retail business group.  A fur trading business for much of its existence, Hudson's Bay Company owns and operates retail stores throughout Canada, Belgium, Germany, the Netherlands, and the United States with Galeria Kaufhof, Gilt, Hudson's Bay, Home Outfitters, Lord & Taylor, and Saks Fifth Avenue.  HBC's head office is in the Simpson Tower in Toronto, Ontario.  The company is listed on the Toronto Stock Exchange under the symbol "HBC".

Massey Place, Saskatoon: Massey Place, is a geographically localised subdivision of the Confederation Suburban Development Area in the city of Saskatoon, Saskatchewan which is nestled around Archibald McDonald Park.  Mcdonald Park is centrally located along the northern perimeter of 33rd Street East.  The school yards of both Vincent Massey School and Bishop Klein School have their western boundaries along Archibald McDonald Park which has as its resources ball diamonds, soccer pitches, winter ice rinks, and playground facilities.  Massey Place neighbourhood is close to amenities provided by both the commercial district of 33rd Street East and the Confederation Suburban Centre.

Supporting paragraphs: Archibald McDonald Hudson's Bay Company
Answer: Toronto, Ontario