TreeHouse Apartments

Portland, OR

A modern 7-story apartment building on Portland’s Marquam Hill near the campus of Oregon Health & Sciences University embraces its forested setting while adding a bold presence on a tight, steep site. The project is LEED Silver certified.

About this Project

Nestled in a forest of alder trees, the 11,000-sf site was previously home to the Ronald McDonald House Charities of Oregon and Southwest Washington for more than 70 years. Designed by Lever Architecture and LRS Architects and developed by Project^, the TreeHouse preserves its forested setting and deploys an octagonal shape to bring views to all units. Surrounded by greenery, the TreeHouse is connected to SW U.S. Veterans Hospital Road via a pedestrian bridge and parking spaces are tucked beneath the first floor.

With a 20-foot drop in grade from one end of the site to the other, site grading and stormwater design posed the primary challenges to 3J’s design. The small site and steep grade hinder management of stormwater, so a combination of systems incorporate filtered catch basins and a flow-through planter to treat roof run-off, and a detention system to treat and detain parking lot run-off. The project is LEED Silver certified.


  • Client

    Project^ Development

  • Completion Date

    August 2015

  • Services

    • Civil Engineering
    • Water Resources Engineering
  • Awards

    • Oregon DLC Top Projects Finalist, 2016
    • AIA Portland, Merit Award, 2015
TreeHouse Apartments

To overcome a steep site, a pedestrian bridge links the entry lobby to SW U.S. Veterans Hospital Road.

TreeHouse Apartments

A shared deck for residents mediates the slope and covers an integrated water filtration garden.

TreeHouse Apartments

Filtering water runoff from the site helped garner LEED Silver certification for the project.