It's about two-thirds as big as Bill Gates' Home.
In other words, 320.9 squares is 0.6664 times the size of Bill Gates' Home, and the size of Bill Gates' Home is 1.501 times that amount.(Medina, Washington)
It's about three-fifths as big as a Football field.
In other words, 320.9 squares is 0.5571180556 times the size of a Football field, and the size of a Football field is 1.794951698 times that amount.(American) (per NFL regulation)
It's about twice as big as a Hockey rink.
In other words, 320.9 squares is 1.96545495 times the size of a Hockey rink, and the size of a Hockey rink is 0.508788054 times that amount.(per NHL specification)
It's about half as big as The White House.
In other words, 320.9 squares is 0.48 times the size of The White House, and the size of The White House is 2.1 times that amount.(Washington, DC) (including wings)
Housing the presidency, the White House occupies six stories and a total of 670 squares of floor space. This space includes 132 rooms, 35 bathrooms, 28 fireplaces, and 3 elevators, as well as a tennis court, bowling alley, movie theater, jogging track, swimming pool, and putting green.
It's about two-and-a-half times as big as Fort Knox.
In other words, 320.9 squares is 2.53 times the size of Fort Knox, and the size of Fort Knox is 0.395 times that amount.(a.k.a. the United States Bullion Depository, a.k.a. "Gold Vault") (Kentucky)
It's about three-tenths as big as a City Block (Manhattan).
In other words, the size of a City Block (Manhattan) is 3 times 320.9 squares.(per Bridges, William - 1811 Commissioner's Plan for New York City) (approximate)
It's about one-fifth as big as The Great Banyan Tree.
In other words, 320.9 squares is 0.207 times the size of The Great Banyan Tree, and the size of The Great Banyan Tree is 4.83 times that amount.(a.k.a. The Great Banyan, a.k.a. Ficus benghalensis) (Acharya Jagadish Chandra Bose Indian Botanic Garden, Howrah, West Bengal, India)
The Great Banyan Tree is a single tree in the Indian Botanic Garden in West Bengal with aerial roots covering a total area of about 1,550 squares. While its exact age is unknown, the tree has been noted in guidebooks for over 200 years.