400 SW Sixth Avenue, Office building in downtown Portland, United States
The 400 SW Sixth Avenue is an office building in downtown Portland that rises to approximately 139 feet across eleven floors. The structure combines office and retail spaces with a distinctive glass mosaic design on its exterior.
The building was originally constructed in 1960 as a six-story First National Bank headquarters. It underwent substantial renovations and expansions in the 1980s and 1990s that also transformed its exterior appearance.
The building shows an important shift in Portland's architectural development, featuring the region's first glass mosaic curtain wall system mounted within aluminum frames.
The building offers good accessibility with high walkability and transit scores in the downtown area. Parking spaces are available on-site, which makes it convenient for visitors arriving by car.
The exterior was transformed from Italian blue mosaic tiles to aluminum and stainless steel in 1992, marking the building's adaptation to changing design standards. This makeover was a striking visual signal of the structure's modernization.
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