"Asylum Block" because of its post-World War II modernist architecture and interior spaces dominated by long, straight corridors lined with identical doors, said by students to resemble that of an insane asylum. Until 2006, it was thought that these residence halls had been designed by architect Pietro Belluschi. Under the 10-year Campus Master Plan adopted in 2006, Foster-Scholz is scheduled to be demolished and replaced, and MacNaughton to be remodeled. According to the master plan, "The College's goal is to provide housing on or adjacent to the campus that accommodates 75% of the [full-time] student population. At present, the College provides on-campus housing for 838 students". In Spring 2007, the college broke ground on the construction of a new quadrangle called the Grove with four new Leed certified residence halls (Aspen, Sequoia, Sitka, Bidwell) on the northwest side of the campus, which opened in Fall 2008. A new Spanish House residence was completed. Together, the five new residences added 142 new beds. Reed also has off-campus housing. Many houses in the Woodstock and Eastmoreland Portland neighborhoods are traditionally rented to Reed students. On February 21, 2018, Reed announced the construction of the "largest residence hall in its history". Completed in Fall 2019, Trillium houses an additional 180 students, boosting Reed's housing capacity to nearly 80% of the student body, up from 68%. The addition of Trillium guarantees housing for both freshman and sophomores, as students were formerly subjected to a housing lottery after freshman year. The new building is also designed to meet "LEED Platinum standards", and Reed is currently evaluating proposals to put solar panels on the roof. Reed Canyon The Reed College Canyon, a natural area and national wildlife preserve, bisects the campus, separating the academic buildings from many of the residence halls (the so-called cross-canyon halls). The canyon is filled by Crystal Creek Springs, a natural spring that drains into Johnson Creek. Canyon Day, a tradition dating back to 1915, is held twice a year. On Canyon Day students and Reed neighbors join canyon crew workers to spend a day helping with restoration efforts. A landmark of the campus, the Blue Bridge, spans the canyon. This bridge replaced the unique cantilevered bridge that served in that spot between 1959 and 1991, which "featured stressed plywood girders – the first time this construction had been used on a span of this size: a straight bridge long and high.