Offshore expansion: A green future for Treasure Island [Financial Times]
Financial Times, March 20 2010

It is either a vision for a new residential utopia in one of the most beautiful spots in the world or the most ill-conceived plan for a new city for a long time. Opinion is divided on a proposal to transform Treasure Island, a 400-acre man-made outcrop with picture-postcard views of San Francisco, into an environmentally sustainable neighbourhood for up to 24,000 residents.
Its supporters appear to be in the ascendant and the result could, they say, create some of the world’s hottest properties; but whether their dream is fulfilled or not the project has some important lessons as cities throughout the world look to islands, both natural and man-made, to try to solve their expansion, transport and housing problems.
Originally built in 1936 to host the Golden Gate International Exposition, Treasure Island is just a couple of miles offshore from San Francisco and considered within its city limits. It is connected by a small isthmus to Yerba Buena Island, the landing point of the Bay Bridge, the only overland link between San Francisco and the East Bay and its urban hubs of Oakland and Berkeley.
Treasure Island’s flat, windswept terrain is home to about 1,400 residents and many abandoned military buildings, oil facilities and electrical transformers. There is little here to connect the site to the book that inspired its name – the site is named after the novel by Robert Louis Stevenson, who lived in San Francisco from 1879 to 1880 – or to suggest the glorious future that is being heralded for it.
Owned by the US Navy, the island was decommissioned in 1996. Last December San Francisco’s mayor, Gavin Newsom, negotiated to buy it in a deal that will see the navy receiving a guaranteed $55m over 10 years from the city, plus an additional $50m if the private investors involved in the project get an 18 per cent return. Newsom is confident the project can be a showcase development, citing the thousands of jobs that will be created and the fact that the money to pay the navy will come from developers, not city coffers. This is a potential sore point for a city that is facing a $522m budget deficit next year.
The proposals are ambitious, particularly in terms of sustainable building – concerns likely to be associated with any island development project and expensive, at an estimated cost of $1.4bn. A master plan developed for the island by architectural and engineering services company Skidmore, Owings and Merrill details up to 8,000 new homes, 30 per cent of which would be affordable to those on lower incomes, several solar-powered skyscrapers, an organic farm, three hotels, several shops and restaurants, a waste-water treatment plant and 300 acres of recreational land. The project’s private development team is a partnership of local company Wilson Meany Sullivan, national homebuilder Lennar Urban and private equity real estate development firm Kenwood Investments.
All of the island’s new streets would be set at a 68° north-south angle in order to minimise wind exposure and two old naval aircraft hangars would be recycled into retail and entertainment centres. Terminal 1, an imposing building featured in the film Indiana Jones and the Last Crusade, would be transformed into a ferry terminal.
On the environmental front, roof-top turbines would provide buildings with power and solar heating systems in the residential areas would supply up to 80 per cent of the new neighbourhood’s hot-water needs. San Francisco has already aggressively reduced the amount of rubbish it sends to landfills but it has upped the ante for Treasure Island, aiming to zero-out solid waste by 2020.
With chronic drought affecting cities across California, water conservation is key. A quarter of the island’s treated water would be recycled for irrigating its farm, as well as for flushing toilets in commercial buildings and washing boats in the marina. The island would still get its potable water from the mainland but, through recycling and conservation measures, it is estimated it would use only 218m gallons per year.
Finally, large-scale wind turbines would be installed in the uninhabited area for energy generation.
The design, which comes in the wake of many years of planning, has already earned a number of awards, including an American Institute of Architects National Honor Award and recognition by the Clinton Climate Initiative, former US president Bill Clinton’s greenhouse gas campaign.
However, sceptics question whether it is sensible to develop an island built out of seismically unsafe sand and gravel in an area of the world known for its earthquakes. In addition, conservation experts predict climate change will raise sea levels more than 4½ft by 2100, casting doubts over the wisdom of developing the island and similar sites worldwide.
“These 400 acres are an example of what can happen to 280 sq miles in the greater San Francisco area,” says Will Travis, executive director at the Bay Conservation and Development Commission, which has jurisdiction over part of the Treasure Island project. He cites places such as downtown San Francisco, its international airport and the newly developed Mission Bay neighbourhood, which are all built on land susceptible to flooding in future. “The obvious strategy is a planned retreat and certainly not to build anything new,” he says. “But instead we are opting for innovation and to adapt to the sea level rise.” He says the levees that are part and parcel of the development designs will be increased in height over time at no cost to the taxpayer.
His attitude to the seismic issue is similarly bullish. “The Bay Area is a bad place to build anything. But we have learned how to build for earthquakes.” He says the advantage of Treasure Island is that it offers the opportunity to start from scratch with the most up-to-date expertise.
There are also transportation issues. Bart, the region’s subway network, does not stop there and the Bay Bridge provides the only road access. Its east span is currently being replaced and is already over capacity and adding thousands of cars could take it to the brink. Travis points out that the goal is to create a compact, mixed-use residential community which is not car-dependent. “There will be a new ferry terminal and buses to San Francisco and the East Bay. A whole fleet of new ferries is currently under construction,” he adds, and mentions Vancouver, site of the recent winter Olympics, as a model for a transit-focused city.
Ruth Gravanis, an environmental advocate in San Francisco, has been monitoring the designs for Treasure Island since 1996. She is supportive of the proposals and feels they have been improved incrementally over time. “As other cities have introduced green initiatives, it has forced this plan to stay in the vanguard,” she says. She likes the fact that housing units are not automatically being sold or rented with parking spaces included and that amenities for cyclists and pedestrians have been incorporated into the proposals. But she believes that for a project attempting to minimise its carbon footprint, there is still too much space devoted to parking. “But I’m cautiously optimistic. They’ve made lots of good changes,” she says. “At first the ferry was going to go the east side of the island. Now it’s the west. It took them a while but they saw sense in the end.”
If San Francisco can keep the project on track and crunch the numbers to make it work, it seems as if support for the development will help push it through. And with cities consuming 75 per cent of our natural resources, a blank-canvas development such this one might just become a blueprint for new communities the world over.
Insular appeal: The enduring allure of the artificial

San Francisco’s Treasure Island is not the only island that was originally built for an international exhibition. Ile Notre-Dame was built in 10 months – from 15m tons of rocks excavated to create the Montreal metro – for Expo 67, a celebration of Canada’s centennial. Expo 67 is considered to have been the most successful world fair of the 20th century, with more than 50m visitors and 62 nations participating. Today the island hosts the Canadian Formula One Grand Prix and much of the open land is enjoyed by rowers, cyclists and, in the winter, ice skaters.
Perhaps the world’s best known artificial islands are in Dubai, where an ambitious initiative has created the Palm Islands and the World Islands, among others, both of which make a dramatic impression when viewed from the sky. The economic downturn has put a halt to the government’s plans to build more islands and so far only the Palm Jumeirah is inhabited. Celebrities such as actor Brad Pitt and soccer players David Beckham and Michael Owen are among those believed to have bought homes there.
Several of the world’s airports have been sited on artificial islands and when London mayor Boris Johnson announced in 2008 that the city’s Heathrow Airport was a “planning error” and that a new airport should be built on an island on the Thames estuary, he might have had Kansai International Airport in his mind’s eye. Located on an artificial island in the middle of Osaka Bay in Japan, Kansai was designed by architect Renzo Piano and opened in 1994. Twenty years in the planning, it became the most expensive civil works project in modern history – costing in excess of $20bn – not least because it was discovered that the island had sunk eight metres as a result of the weight of the material used in construction.
Other airports on islands include Chubu Centrair International Airport, New Kitakyushu Airport and Kobe Airport, all in Japan. Hong Kong International Airport, designed by Foster & Partners, was created using land reclamation from the existing islands of Chek Lap Kok and Lam Chau.











Many universities around the world boast architecturally distinctive buildings. Oxford has the Bodleian Library and some of its halls of residence date back to the 12th century. Baker House at the Massachusetts Institute of Technology was designed by Alvar Aalto, his only North American building. Princeton has Spelman Hall, designed by IM Pei, while Frank Lloyd Wright built the Robie House in 1910, which was subsequently bought by the University of Chicago. But all these buildings are the property of the academic institutions, which are responsible for their maintenance and preservation.
But 2307 Piedmont Avenue, the three-storey, shingle-clad Thorsen House stands out for being remarkably intact. With its exaggerated roof overhangs, swathes of clinker-brick walls and stained glass panels, it is known as the last of the four “ultimate bungalows” designed by the Greene brothers, whose aesthetic, like that of the UK’s William Morris, was founded on artisanship and “honest” materials. Custom-built for William Thorsen, a lumber baron, his wife and children, the home’s interiors showcase the architects’ exquisite attention to detail and superlative standard of craftsmanship, including elaborate joinery and custom-painted friezes.

