Dekum Building

The Dekum
Portland Historic Landmark
Viewed from the northeast in 2019
Location505–519 SW 3rd Avenue
Portland, Oregon
Coordinates45°31′10″N 122°40′31″W / 45.519464°N 122.675225°W / 45.519464; -122.675225
Built1891–92
ArchitectMcCaw, Martin and White
Architectural styleRomanesque
NRHP reference No.80003363
Added to NRHPOctober 10, 1980

The Dekum or the Dekum Building is a historic office building in downtown Portland, Oregon, United States. It was listed on the National Register of Historic Places in 1980.

With its rusticated sandstone base, over-scaled arches at street level, and stone carvings, the eight-story building is a strong example of Romanesque Revival architecture. It was made completely from materials found in Oregon. Completed in 1892, it is named after Frank Dekum, a German immigrant who opened Portland's first candy shop. Construction cost US$300,000 in 1892, equivalent to $9,100,000 in 2023. During construction, masons reportedly drank beer instead of the usual coffee.