The principal structure consists of a four-story, 580-foot (180 m) long Administration Building and a three-story, 880-foot (270 m) long Hall of Justice at a lower elevation, joined at a 120-degree angle with an 80-foot (24 m) diameter rotunda.
The Hall of Justice spans a small valley, arching twice over an access road and a parking area, while the Administration Building spans a smaller ravine.
 Both structures are entered through archways on their lower levels.
The long principal facades are marked by shallow non-structural arches of decreasing span with each story.
The arches, which are framed in metal with a stucco appliqué, overlap slightly at the lower level.
On the intermediate level, they appear to stand on short slender gold-anodized columns, and on the top level, they become round openings with gold railings directly under the deep roof overhang.
The railings themselves have a circular pattern.
The bright blue roof is itself patterned with arched cut-outs and raised circular patterns The building wings are arranged as a barrel vault shape on either side of the central galley, asymmetrically disposed.
Interior guardrails at the atrium are solid stucco with no metal elements.
Entrances are controlled by vertical grills of gold-anodized metal with rounded tops and bottoms, rather than doors.
The eaves are embellished with an arched fascia with small gold balls inset in each arch, a pattern repeated in the atria.

The rotunda on the central hill houses the county library and a central cafeteria.
 Its 172-foot (52 m) gold spire was meant to house a radio transmitter, as well as the boiler plant's chimney.
The interiors are arranged around open atria or "malls" as Wright called them, which allow natural light into the space.
 Originally open to the sky, the malls were later covered with skylights designed by William Wesley Peters.
Interior spaces featured glass walls to allow light to penetrate from the exterior and the atrium, and to follow through on Wright's philosophy of maximum openness of government activities.

Wright's concept envisioned a gold-colored roof, which proved to be impossible to obtain in a long-lasting material.
After Wright's death, Olgivanna Wright chose a bright blue color that would weather well, gaining a softer color with age.
The color choice, together with the pink stucco walls, was initially controversial, causing the building to become known as "Big Pink".
The only large gold element is the spire at the rotunda.
The principal structure consists of a four-story, 580-foot (180 m) long Administration Building and a three-story, 880-foot (270 m) long Hall of Justice at a lower elevation, joined at a 120-degree angle with an 80-foot (24 m) diameter rotunda. The Hall of Justice spans a small valley, arching twice over an access road and a parking area, while the Administration Building spans a smaller ravine.  Both structures are entered through archways on their lower levels. The long principal facades are marked by shallow non-structural arches of decreasing span with each story. The arches, which are framed in metal with a stucco appliqué, overlap slightly at the lower level. On the intermediate level, they appear to stand on short slender gold-anodized columns, and on the top level, they become round openings with gold railings directly under the deep roof overhang. The railings themselves have a circular pattern. The bright blue roof is itself patterned with arched cut-outs and raised circular patterns The building wings are arranged as a barrel vault shape on either side of the central galley, asymmetrically disposed. Interior guardrails at the atrium are solid stucco with no metal elements. Entrances are controlled by vertical grills of gold-anodized metal with rounded tops and bottoms, rather than doors. The eaves are embellished with an arched fascia with small gold balls inset in each arch, a pattern repeated in the atria.
The rotunda on the central hill houses the county library and a central cafeteria.  Its 172-foot (52 m) gold spire was meant to house a radio transmitter, as well as the boiler plant's chimney. The interiors are arranged around open atria or "malls" as Wright called them, which allow natural light into the space.  Originally open to the sky, the malls were later covered with skylights designed by William Wesley Peters. Interior spaces featured glass walls to allow light to penetrate from the exterior and the atrium, and to follow through on Wright's philosophy of maximum openness of government activities.
Wright's concept envisioned a gold-colored roof, which proved to be impossible to obtain in a long-lasting material. After Wright's death, Olgivanna Wright chose a bright blue color that would weather well, gaining a softer color with age. The color choice, together with the pink stucco walls, was initially controversial, causing the building to become known as "Big Pink". The only large gold element is the spire at the rotunda.
Marin County Civic Center