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Professional structural design services from concept planning through construction

Located in La Mesa, CA, GSSI provides professional structural design services from concept planning through construction. We provide all aspects of structural engineering services for a large variety of building and non-building structures, new structures, renovations to existing facilities, and seismic evaluations/upgrades for existing structures.


GSSI provides many services to a wide range of clients varying from architects, developers, contractors, owners, businesses of various corporations and state and federal government agencies. The projects that we service have a wide range as well.


GSSI has a proven track record of success spanning nearly 20 years.

GSSI Structural Engineers was founded in 2003 in San Diego, California. The Principals combine over 50 years of local structural engineering experience, completing over 900 projects. Having extensive experience in the military sector, GSSI Miyamoto will be working on DoD projects.

In 2020, Miyamoto announced its partnership with GSSI. The partnership marks the formation of one of the largest structural engineering firms in the San Diego region.

Alliance with powerful foundations and buildings with intelligent designs


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Our extensive and diverse experience and state of the art technology allow us to solve complex design issues efficiently



Projects range from small remodels to new buildings on various bases throughout California.

Some of Our Work:

  • – Island Club Renovation- NAB Coronado
  • – Regimental Maintenance Complex – Camp Pendleton
  • – CNATT Aviation Training Facility
  • – San Clemente BEQ


Projects typically include everything from remodels and equipment support to building expansions and new headquarters buildings.

Some of Our Work:

  • – Amylin Pharmaceuticals Laboratories
  • – Gilead Building Expansion
  • – IONIS Corporate Headquarters
  • – Arena Corporate Center
  • – UCSD Central Plant
  • – Qualcomm Central Plant
  • – General Atomics Buildings Expansion


Educational projects vary from new HVAC upgrades and modernizations to entire new campuses. Projects are typically submitted and approved by Division of State Architect (DSA).

Some of Our Work:

  • – The Bishop’s School Library
  • – Cochella Valley Library
  • – Granite Hills Science Building
  • – Santa Fe Christian Science Building
  • – Orange Glen High School
  • – San Marcos K-8 School
  • – Willow Elementary School


Projects range from medical office buildings to remodels and expansion project hospitals, primarily through OSHPD.

Some of Our Work:

  • – Temecula Medical Office Building
  • – Hoang Tustin Ranch Medical Office Building
  • – El Sol Wellness Center
  • – Pomerado Medical Office Building
  • – Ramona Medical Clinic
  • – Los Alamitos Medical Center
  • – Alvarado Hospital ER Addition
  • – Sharp Rees Steely Medical Office Building


Projects include new office buildings, both for speculative development and owner occupied.

Some of Our Work:

  • – Mission City Corporate Center
  • – ARC of San Diego Training Facility
  • – Quinn Office Building
  • – Torrey Hills Center
  • – Palomar Pointe Corporate Center
  • – Ocean Ridge Corporate Center
  • – Torrey Hills Medical Office Building


Projects include new hotels, casinos and parking structures all ranging from small additions or remodels to low and high rise structures.

Some of Our Work:

  • – Jackson Rancheria Casino Expansion
  • – Torrey Hills Parking Structure
  • – Fantasy Springs Parking Structure
  • – El Segundo Parking Structure
  • – LA Air Force Parking Structure
  • – Sharp MOB Parking Structure
  • – Flower Hill Parking Structure
  • – Pechanga Clubhouse
  • – Legoland Hotel
  • – Japanese Friendship Garden Expansion
  • – San Diego Zoo – Australian Outback
  • – Callaway Wine Tasting Room
  • – Ballast Point Brewery and Restaurant
  • – Agua Caliente Theater
  • – Europa Village Hotel / Winery
  • – Quechan Hotel and Casino
  • – Chumash Hotel and Casino
  • – Pechanga Casino Expansion
  • – Westfield Plaza Bonita Parking Structure


Projects include both cast-in-place and precast concrete structures.

Some of Our Work:

  • – Fantasy Springs Parking Structure
  • – Torrey Hills Parking Structure’
  • – El Segundo Parking Structure
  • – LA Air Force Parking Structure
  • – Sharp MOB Parking Structure
  • – Flower Hill Parking Structure
  • – Westfield Plaza Bonita Parking Structure

Feel Free to Reach Out to Us

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