LEAVE OUR INDUSTRY
BETTER THAN WE
FOUND IT.

LEAVE OUR
INDUSTRY
BETTER THAN
WE FOUND IT.

Armadillo & Co.

Los Angeles, CA | 5K SF

A BRIEF HISTORY.

With 49 years of combined experience, our founders launched GCX in 2018 to build with purpose, passion, and precision. We're committed to crafting architecturally driven spaces where great design meets exceptional execution.

$700M

Completed Works

120+

Award & Accolades

200+

Allies & Partnerships

WHY GCX?

GCX delivers a seamless project experience rooted in transparency, advocacy, and collaboration. We minimize friction, foster open dialogue, and ensure every stakeholder feels supported, creating enduring partnerships that last well beyond the project.

Some of our clients and partners

BUILT TO NAVIGATE.

Passionate builders, problem-solvers, and collaborators. We bring diverse expertise and a shared commitment to delivering exceptional results.

Jarred Walker

Principal/Managing Partner

Jarred Walker

Principal/Managing Partner

As Principal and Founder of GCX, Jarred is actively involved in all phases of our projects, with a strong focus on preconstruction. His leadership fosters collaborationm and encourages innovative thinking. Driving cost-saving solutions, Jarred remains engaged throughout the project lifecycle.

Greg O’Connor

Principal/Managing Partner

Greg O’Connor

Principal/Managing Partner

As Principal and Founder of GCX, Greg leverages 38 years of industry experience to build relationships, identify opportunities, and drive new projects. His deep knowledge of commercial construction strengthens client trust and supports GCX's continued growth.

Jillian Lang

Director of Project Management

Jillian Lang

Director of Project Management

Jillian brings over 15 years of experience to GCX, where her expertise and achievements have been vital to the company’s success. Her leadership has built a resilient, high-performing team capable of delivering extraordinary results.

Frank Treptow

General Superintendent

Frank Treptow

General Superintendent

Frank is an experienced construction leader with a strong background in tenant improvements and commercial projects. He excels at managing teams in the field, maintaining strict safety compliance, and driving projects to successful, on-time completion with a focus on quality and efficiency.

Lauren Nielsen

Director of Client Experience

Lauren Nielsen

Director of Client Experience

As Director of Client Experience, Lauren builds lasting relationships and serves as a trusted resource for clients and industry partners. She champions collaboration, drives community impact, and represents GCX as a strong voice in the commercial real estate and construction markets.

Julia Qi

Senior Controller

Julia Qi

Senior Controller

Julia oversees GCX’s financial operations with precision and care. She ensures accuracy in reporting, strengthens financial processes, and provides the insight needed to guide strategic decisions. Her steady leadership supports both the company’s growth and the success of its teams.

Veronica Izmajtovich

Director of Operations

Veronica Izmajtovich

Director of Operations

Veronica drives efficiency and alignment across all aspects of GCX. Her leadership ensures that processes run seamlessly, teams stay connected, and projects maintain the highest standards of quality and delivery. With a focus on structure and collaboration, she empowers teams to perform at their best while keeping the big picture in view.

AWARDS.

2024

LABJ Commercial Real Estate Awards, Bronze, Best New Headquarters

PlayQ

2024

LABJ Commercial Real Estate Awards, Silver, Award for Retail

Armadillo & Co.

2024

LABJ Valley Commercial Real Estate Awards, Best New Headquarters 2024

Poms & Associates

2024

Los Angeles Business Journal, Women of Influence

Lauren Nielsen

2023

Los Angeles Business Council, Architectural Awards

Saffy’s

2023

LABJ Commercial Real Estate Awards, Bronze Award

Mr. T

2023

LABJ Commercial Real Estate Awards, Silver Award for Office

350 S Grand Ave

2023

LABJ Commercial Real Estate Awards, Silver Award

Andersen Tax

2023

SFVBJ Commercial Real Estate Awards, Silver for Best New HQ

Colliers

2023

Calibre, People’s Choice Award

Confidential Animation Client

2022

REmmy Awards, Innovative Workplace Award

Athletic Performance Center

INDUSTRY INSIGHTS.

A closer look at the trends and perspectives shaping what we build next.

The Construction Conundrum

November 5, 2025

Cartoon Introduction The depicted “Tree Swing” graphic begins with the client’s initial request, portrayed as

The Silent Killer of Projects

October 30, 2025

In construction, communication isn’t just a soft skill, it’s the backbone of delivering projects on

To Build or Not to Build?

October 23, 2025

Introduction For the majority of companies, physical real estate is a major equation in their

I Worked Out With an AI Trainer at L.A.’s ‘First Full-Scale AI-Powered Gym.’ Here’s How It Went.

March 31, 2025

Read the Full Article

STUDIOS Principal

"GCX is the best kept secret in Los Angeles"

-STUDIOS Principal

GENSLER PARTNER

"GCX is making construction sexy again."

-Gensler Partner

BLACKSTONE GROUP

"How did you catch that detail? So grateful to have GCX on this project, this would be a mess without you."

-Blackstone Group

HOSPITALITY DEVELOPER

"The principals care about their clients and have a passion for construction. The service and experience I receive is naturally elevated because of that."

-Hospitality Developer

TALENT AGENCY CLIENT

"How did you catch that detail? So grateful to have GCX on this project, this would be a mess without you."

-Talent Agency Client

LEAVE OUR INDUSTRY BETTER THAN WE FOUND IT.

LEAVE OURINDUSTRYBETTER THANWE FOUND IT.

Armadillo & Co.

A BRIEF HISTORY.

$700M

120+

200+

WHY GCX?

Some of our clients and partners

BUILT TO NAVIGATE.

Jarred Walker

Jarred Walker

Greg O’Connor

Greg O’Connor

Jillian Lang

Jillian Lang

Frank Treptow

Frank Treptow

Lauren Nielsen

Lauren Nielsen

Julia Qi

Julia Qi

Veronica Izmajtovich

Veronica Izmajtovich

AWARDS.

INDUSTRY INSIGHTS.

The Construction Conundrum

The Silent Killer of Projects

To Build or Not to Build?

I Worked Out With an AI Trainer at L.A.’s ‘First Full-Scale AI-Powered Gym.’ Here’s How It Went.

STUDIOS Principal

GENSLER PARTNER

BLACKSTONE GROUP

HOSPITALITY DEVELOPER

TALENT AGENCY CLIENT

Let's Build Together

LEAVE OUR INDUSTRY
BETTER THAN WE
FOUND IT.

LEAVE OUR
INDUSTRY
BETTER THAN
WE FOUND IT.