to 30,000 tons of raw sugar. It remains private, but arrivals at the port are recorded by the Ports of Auckland and subject to Customs and MAF regulations. As the ships generally exceed , the ships require pilotage, managed by the Ports of Auckland's Harbour Control. Some of the land was in the ownership of the Ports of Auckland, and leased to Chelsea. In 1997, approval was granted for Chelsea to purchase the land, a total of nine hectares. The port is located up-harbour from the Harbour Bridge, thus enforcing a large central span (243.8 m) and height (43.27 m at high tide). Architectural and cultural impact Chelsea is more than a landmark on the coast; it has been central to the development of the local community and remains active in preserving and encouraging interest in the local heritage and local events, sponsoring things as diverse as school trails and the publication of local histories. As part of the company's interest in preserving its early heritage for later generations, it has entrusted its archives to the Birkenhead Public Library. These Chelsea Archives contain company records, including wage books, legal files, and share registers from throughout its history. The architectural and social importance of the site is recognised by Heritage New Zealand. The early factory buildings, manager's house, and brick houses have Category II listings, and the site as a whole is recognised for its industrial heritage. As one of the largest complexes in New Zealand, and one of the few refineries in the South Pacific, it helped to established New Zealand as an economic force. Throughout its history, Chelsea has allowed the public open access to its significant grounds, which comprise wetlands, lakes, open space, and bush. To ensure the parkland -and its access- is maintained, has become a public legacy. Among the other cultural impacts which the refinery has had on its surrounds is the origin of top local association football team Glenfield Rovers. The club, founded as Chelsea F.C. in 1960, was originally a social club for staff at the refinery. It later became more than just a social side, and has among the strongest teams in the Auckland region since the mid-1990s. The club reached the semifinals of the national Chatham Cup competition in 2008. In modern times Chelsea operates 24 hours a day, 5 days per week, and remains New Zealand's market leader in sugar products.