Cascade is an urban neighborhood abutting Downtown Seattle, Washington, United States, located adjacent to South Lake Union. It is bounded by: Fairview Avenue North on the west, beyond which is the rest of the Cascade Neighborhood; the Interstate 5 interchange for Mercer St to the north, beyond which is Eastlake; Interstate 5 on the east, beyond which is Capitol Hill; and Denny Way on the south, beyond which is Denny Triangle. It is surrounded by thoroughfares Mercer Street (eastbound), Fairview Avenue N. and Eastlake Avenue E. (north- and southbound), and Denny Way (east- and westbound). The neighborhood, one of Seattle's oldest, originally extended much further: west to Terry Avenue, south to Denny Hill (regraded away 1929–1931) on the South, and east to Melrose Avenue E through the area now obliterated by Interstate 5. Some recent writers consider Cascade to omit the northern "arm" (east of Lake Union), while others extend it westward to cover most of South Lake Union. Historic structures in Cascade Neighborhood include St Spiridon's Orthodox Cathedral, Immanuel Lutheran Church, and several defunct laundry blocks. In 2007, a development named Alley24 was built around the New Richmond Laundry Building, a City of Seattle Landmark located between John and Thomas Streets and Yale and Pontius Avenues North. The historic façade was maintained in the new design by architecture firm NBBJ, who also relocated their headquarters to Alley24. The property is jointly owned by PEMCO and Paul Allen's development company Vulcan Inc. Vulcan owns roughly approximately 6 acres in Cascade Neighborhood, a lower percentage of the land than in the rest of South Lake Union. History Cascade grew up in the late 19th and early 20th century as a blue-collar neighborhood with a mixture of housing and one of the city's first industrial areas. It was the original home of St. Demetrios Greek Orthodox Church (built 1919–1921; congregation moved 1963; demolished 1995), and remains the home of St. Spiridon Russian Orthodox Cathedral (established 1895, present church completed 1938) and Immanuel Lutheran Church (established 1890, present church completed 1912). Pioneers Like most of Seattle, the Cascade Neighborhood was originally heavily forested. In the 1860s, David Denny and Thomas Mercer first claimed portions of this land. However, initial development was a bit west of Cascade, at southwest Lake Union, which became a transportation nexus and where Denny established the lake's first sawmill. By the 1880s, more mills and more cleared land led