It's about one-fifth as big as a Polo field
In other words, 889.90 squares is 0.164796296 times the size of a Polo field, and the size of a Polo field is 6.0680976 times that amount.(for field polo) (United States Polo Association rules; unboarded side maximum)
An outdoor polo field must measure 274.32 m in length and 146.304 m to in width for a total playing area of up to 5,400 squares. Polo traces its origins to an Iranian (then Persian) war game from the 5th Century, which was played with as many as 100 players per side.
It's about one-fifth as big as Rogers Centre
In other words, 889.90 squares is 0.161 times the size of Rogers Centre, and the size of Rogers Centre is 6.21 times that amount.(f.k.a. Skydome) (Toronto, Ontario, Canada) (entire complex)
Rogers Centre, a major sports stadium in downtown Toronto, measures a total of 5,530 squares over the entire complex. The video board of Rogers Centre has a total area of 36.60 squares.
It's about one-fifth as big as Windsor Castle
In other words, 889.90 squares is 0.16 times the size of Windsor Castle, and the size of Windsor Castle is 6.3 times that amount.(Windsor, England) (total site area)
One of the official residences of the British monarch, Windsor Castle measures about 5,700 squares. It is the largest inhabited castle in the world and is also the oldest in continuous use, having been occupied since it was built by William the Conqueror about 900 years ago.
It's about six-and-a-half times as big as Manchester Cathedral
In other words, 889.90 squares is 6.678 times the size of Manchester Cathedral, and the size of Manchester Cathedral is 0.1497 times that amount.(a.k.a. Cathedral and Collegiate Church of St Mary, St Denys and St George) (Manchester, England, United Kingdom) (total interior area of Nave, Chapel, Library, Chapter House, and Rectory)
Manchester Cathedral includes a total interior area of 133.30 squares between the Nave, Chapel, Library, Chapter House, and Rectory. The height of the Cathedral's bell tower is 41.1 m.
It's about seven times as big as Fort Knox
In other words, 889.90 squares is 7.0 times the size of Fort Knox, and the size of Fort Knox is 0.143 times that amount.(a.k.a. the United States Bullion Depository, a.k.a. "Gold Vault") (Kentucky)
The United States Bullion Depository, commonly referred to by the metonym "Fort Knox" (in spite of the fact that the Depository is not located on the Fort proper), measures 32.0 m (105 ft) by 36.9 m (121 ft), for a total area of about 127 squares. The Depository is most famous for housing the largest portion of the national gold reserve, but has also temporarily housed the original US Declaration of Independence, an original copy of the US Constitution, and other important documents, kept there for safe keeping during World War II.
It's about one-tenth as big as Croke Park
In other words, 889.90 squares is 0.13 times the size of Croke Park, and the size of Croke Park is 7.7 times that amount.(a.k.a. Páirc an Chrócaigh) (Dublin, Leinster, Ireland) (stadium area)
Croke Park, the Gaelic games stadium of Dublin, hosts hurling and Gaelic football matches in a 7,000 squares stadium. The Park offers rooftop tours, where fans can walk along the 44-meters-high walkway.
It's about one-tenth as big as Buckingham Palace
In other words, 889.90 squares is 0.11 times the size of Buckingham Palace, and the size of Buckingham Palace is 9.1 times that amount.(a.k.a. Buckingham House) (Westminster, London, England)
Buckingham Palace, the official residence of the British monarch, contains about 8,300 squares of total floor space. The palace was first inhabited by Queen Victoria in 1831, although after the death of her husband in 1861, the Queen endeavored to spend as little time there as public opinion would allow.