Greenfield vs. Brownfield#

Greenfield development refers to building on previously undeveloped land, typically agricultural or forest land located on the urban fringe. Because Oregon’s land use laws prioritize the preservation of farm and forest lands, greenfield development is strictly regulated and generally occurs only when a city expands its Urban Growth Boundary (UGB) to accommodate demonstrated housing needs. While greenfield sites offer a “clean slate” for developers, they often require significant new infrastructure investments (roads, sewers, utilities) and are the primary subject of debates regarding urban sprawl versus housing supply.

Brownfield development, conversely, involves the redevelopment of previously used industrial or commercial sites that may be complicated by environmental contamination. Oregon actively encourages brownfield redevelopment—such as transforming old gas stations, mills, or rail yards into housing—as a strategy to revitalize neighborhoods and reduce pressure on greenfield expansion. Projects like “The Yards” in Portland demonstrate how these sites can be remediated to provide essential affordable housing close to existing services and transit, though they often face higher upfront costs and regulatory complexities related to cleanup.