It's about 0.000000006 times as big as Rogers Centre
In other words, 0.00000002850 hectares is 0.000000005540 times the size of Rogers Centre, and the size of Rogers Centre is 181,000,000 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 5.140 hectares over the entire complex. The video board of Rogers Centre has a total area of 0.034 hectares.
It's about 0.000000006 times as big as Windsor Castle
In other words, 0.00000002850 hectares is 0.00000000540 times the size of Windsor Castle, and the size of Windsor Castle is 190,000,000 times that amount.(Windsor, England) (total site area)
One of the official residences of the British monarch, Windsor Castle measures about 5.30 hectares. 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 0.000000005 times as big as Croke Park
In other words, 0.00000002850 hectares is 0.00000000440 times the size of Croke Park, and the size of Croke Park is 230,000,000 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 6.50 hectares stadium. The Park offers rooftop tours, where fans can walk along the 44-meters-high walkway.
It's about 0.000000004 times as big as Buckingham Palace
In other words, 0.00000002850 hectares is 0.00000000370 times the size of Buckingham Palace, and the size of Buckingham Palace is 270,000,000 times that amount.(a.k.a. Buckingham House) (Westminster, London, England)
Buckingham Palace, the official residence of the British monarch, contains about 7.70 hectares 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.
It's about 0.000000003 times as big as Alcatraz
In other words, 0.00000002850 hectares is 0.00000000320 times the size of Alcatraz, and the size of Alcatraz is 310,000,000 times that amount.(a.k.a. The Rock) (California)
Alcatraz Island measures 8.90 hectares. It is known a part of the Golden Gate National Recreation Area, and has historically served as a lighthouse, fort, military prison, and — most famously — a federal prison.
It's about 0.000000003 times as big as King Shaka International Airport (DUR)
In other words, 0.00000002850 hectares is 0.000000002770 times the size of King Shaka International Airport (DUR), and the size of King Shaka International Airport (DUR) is 361,000,000 times that amount.(a.k.a. KSIA) (La Mercy, Durban City, eThekwini Municipality, KwaZulu-Natal, South Africa) (total terminal area)
King Shaka International Airport includes a main passenger terminal, with a total area of 10.30 hectares. The airport's single, main runway stretches 3,700 m in length. http://www.durban-tourism.com/King-Shaka.html - 21 sq. km land purchase??
It's about 0.000000003 times as big as Ellis Island
In other words, 0.00000002850 hectares is 0.000000002570 times the size of Ellis Island, and the size of Ellis Island is 389,000,000 times that amount.(Jersey City, New Jersey and New York City, New York)(now officially part of the Statue of Liberty National Monument)
Ellis Island, home of the Ellis Island Immigration Station, is 11.10 hectares in total area. Nine-tenths of the island were artificially created after the New York-New Jersey borders had already been defined, leading to a sovereignty dispute which was settled by the US Supreme Court in 1998.