One Broadway Plaza

The One Broadway Plaza (“The One”) was planned to reach 493 feet and feature more than 615,000 square-feet of office space in 37 stories. Cannon provided survey and civil engineering services for the preliminary project design, due diligence, and construction documents for the office building, including a three-level parking structure and major off-site roadway improvements in downtown Santa Ana.

Cannon’s design included major street vacation improvements; an additional lane on the main street of Sycamore; conversion of 10th, Broadway, and Main Streets to eastbound one-ways; conversion of Washington Avenue into a one-way westbound flow; as well as six major intersection modifications to satisfy environmental conditions, including four traffic signal modifications and two new traffic signal designs.

Each intersection required adding a right-turn lane, right-of-way engineering, coordination with parcel owners and clients for additional right-of-way acquisitions, and design and coordination with City staff. The project included an I-5 off-ramp redesign that involved Caltrans permitting, coordination, and approval.

This project required relocating existing dry utilities along 10th Street, Washington Street, and Broadway Street, as well as relocating wet and dry utilities in Sycamore Street so that it could be vacated. Cannon provided necessary coordination with Edison Southern California Gas, AT&T, and the City, for water and sewer relocations.

Survey services included an ALTA survey map, lot line adjustment, final tract map, and aerial strip topography for traffic mitigation study. Cannon helped expedite the coordination process through the City of Santa Ana for street vacationing, realigned public streets, and ten left- and right-turn pockets.

Civil engineering services included a rough grading plan, precise grading, water and sewer, storm drainage plan, hydrology and hydraulic studies, horizontal control plan, utility relocation, street improvement, survey, and mapping.


Santa Ana, California

Key Elements

  • Civil Engineering
  • Grading and Drainage
  • Survey and Mapping
  • Utility Design
  • Expedited Permitting
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