The Ardea, formerly 3720, is a 30-story 99.06 m (325.0 ft) apartment skyscraper in the South Waterfront district of Portland, Oregon.

The building was completed in March 2009, however was turned over in phases allowing occupancy beginning in August 2008.

The Ardea joins John Ross Tower as the seventh tallest building in Portland.

The exterior cladding of the building is constructed with a variety of materials including window wall, curtain wall, precast concrete panels, and a metal cladding system.

The Ardea received an Excellence in Concrete Award in 2009 for the unique application of precast that runs up the exterior of the building in two vertical bands on both the north and south faces.