Allen's Vulcan Real Estate division offers development and portfolio management services, and is known for the redevelopment of the South Lake Union neighborhood immediately north of downtown Seattle. Vulcan has developed 6.3 million square feet (590,000 m) of new residential, office, retail and biotechnology research space, and has a total development capacity of 10,000,000 sq ft (930,000 m). Vulcan advocated for the Seattle Streetcar line known as South Lake Union Streetcar, which runs from Seattle's Westlake Center to the south end of Lake Union. In 2012, The Wall Street Journal called Allen's South Lake Union investment "unexpectedly lucrative" and one that led to his firm selling a 1,800,000-square-foot (170,000 m) office complex to Amazon.com for US$1.16 billion, one of the most expensive office deals ever in Seattle. "It's exceeded my expectations", Allen said of the South Lake Union development.