A Vancouver-based development company has teamed up with Japan’s largest homebuilder to develop $600 million worth of apartments in urban centers from Seattle to Los Angeles, all geared for the bike-riding, walking and public-transit-riding “Y” generation.The developments would add a total of 2,330 apartments in Seattle; Hillsboro, Ore.; Denver; and Los Angeles, said Clyde Holland, chief executive officer and chairman of Vancouver-based Holland Partner Group. The five sites share common location attributes such as being within light-rail commute or walking distance of high-paying office, professional and tech-sector jobs, said Holland.The developer joined up with investor North America Sekisui House LLC. The Arlington, Va.-based company is the U.S. arm of Osaka, Japan-based Sekisui House, which also operates in Australia and China.“We are investment partners in these projects and we’ll be working hand in hand in how the projects are designed,” said Holland, who founded Holland Partner Group in 2001 to build multifamily housing in high-demand rental markets.Publicly traded Sekisui House, founded in 1960, appears to have wised up early on to the current business adage that what’s good for the planet is also good for the company. Sekisui House announced its environmental future plan in 1999 and 2001, and the company launched an award-winning landscape concept to promote biodiversity. Sekisui is also a leader in energy-saving designs aimed at producing zero emissions and was awarded in 2006 for its response to global warming by the Japanese Minister of Environment, according to the company’s website.