One Broadway Plaza

Location: Santa Ana, California
Client: City of Santa Ana / Caribou Industries

Project Elements

  • 37-Story Office Building with a Three-Level Parking Structure and Major Off-Site Roadway Improvements
  • Survey and Civil Engineering Services
  • Six Major Intersection Modifications
  • I-5 Off-Ramp Design per Caltrans Requirements and Approvals
  • Relocation of Dry and Wet Utilities
  • ALTA Survey Map
  • Lot Line Adjustment
  • Final Tract Map
  • Aerial Strip Topography for Traffic Mitigation Study
  • Expedited Coordination of Street Vacationing, Realigned Public Streets, and Ten Right- and Left-Turn Pockets through the City of Santa Ana
  • ROW Take
  • Rough Grading Plan
  • Precise Grading,
  • Water and Sewer
  • Storm Drainage Plan
  • Hydrology and Hydraulic Studies


PENCO provided survey and civil engineering services for the preliminary project design, due diligence, and construction documents for a 545,124-square foot, 37-story office building, including a three-level parking structure and major off-site roadway improvements on several streets and intersections in downtown Santa Ana. Upon completion, One Broadway Plaza will be the tallest building in Orange County.

The project included major street vacation improvements; additional lane on the main street of Sycamore, between 10th Street and Washington Avenue; 10th Street, Broadway Street, and Main Street included conversion to a one-way eastbound; and improvements of Washington Avenue, between Broadway Street and Main Street, were converted to a one-way westbound flow.

The project included six major intersection modifications to satisfy environmental conditions, which included four traffic signal modifications and two new traffic signal designs. At each intersection, a required right-turn lane was added, which included right-of-way take engineering; coordination with parcel owners and clients for additional right-of-way acquisitions; and design and coordination with the City staff.

The project included I-5 off-ramp redesign, per Caltrans requirements, which required a Caltrans Permit. The redesign of this off-ramp was designed and coordinated with Caltrans staff. Caltrans approvals were obtained.

This project included relocation of existing dry utilities along 10th St., Washington St., Broadway St., and Sycamore. All wet and dry utilities in Sycamore Street were also relocated so that it could be vacated. PENCO provided necessary coordination with Edison Southern California Gas, AT&T, and the City for water and sewer relocations.

Survey services included ALTA survey map, lot line adjustment, final tract map, and aerial strip topography for traffic mitigation study. PENCO helped expedite the coordination process through the City of Santa Ana for street vacationing, realigned public streets, and 10 left- and right-turn pockets.

Civil engineering services, including 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.

We’re pleased to announce that we merged with Cannon on August 1, 2018.

As we fully transition into the Cannon family, our website will redirect visitors to our parent company, Cannon Corporation’s, website, If you’d like to find out more about the merger, read about it in this press release.