Halcyon is a neighborhood-designed and initiated park built in the center of Halcyon Court in an area that was once a 28 space parking lot. They planted 22 trees and some 500 bushes and flowering shrubs. The commons includes a community herb and flower garden, a tire swing and lawn areas for children to play, a community-built arbor with wisteria, and a neighborhood bulletin board.
Neighbors participate in the ongoing maintenance of the commons.
This small community garden site is the location of a community commons, created through money from the City of Berkeley and in kind contributions. The corner garden site is surrounded by a hand-crafted trellis, a curved bench and a sunlight gardening building. The commons is wheelchair accessible and a meeting place for many. HopPer Commons Association organizes the common's events with respect for the serenity of the gardening work. The development of the entire Presidio has taken into account the principles of sustainability.