San Diego Office

ES3’s San Diego office serves as our corporate headquarters. Financial accounting, purchasing, accounts payable, accounts receivable, and human resources are managed from this site at 550 West C Street, Suite 1630, San Diego, California 92101. Please call 619-338-0380.

ES3 has the highest standards for fiscal responsibility. The Defense Contract Audit Agency (DCAA) and/or the Defense Contract Management Agency (DCMA) have audited and approved the ES3 Accounting System, the ES3 Government Property Management System, and the ES3 Purchasing System.

ES3’s San Diego office is located in the heart of downtown San Diego with state-of-the-art computing, conferencing, and teleconferencing facilities serving ES3 administrative and engineering staff as well as government auditing agencies, technical team members, and clientele.

By Air:

The ES3 San Diego office is a ten minute cab ride from the San Diego International Airport (SAN).


By Rail:

The ES3 San Diego office is one block from San Diego’s historic Santa Fe Station with train service to Los Angeles.


By Car:

Parking is provided beneath the ES3 office. Enter the parking garage marked “550 Corporate Center” on Columbia Street between West B Street and West C Street. After parking, bring your parking ticket up to our office for validation. Please note that West C Street is not a drivable road but rather the local San Diego Trolley line.


These hotels are across the street and just steps away from ES3’s office:

The Westin San Diego

400 West Broadway
San Diego, CA 92101

Hotel Republic

421 West B Street
San Diego, CA 92101

And located a walkable five blocks from ES3 is the Ulysses S Grant Hotel, a historic landmark built by the son of former President Grant. This hotel sits on the edge of San Diego nightlife and the historic Gas Lamp District.

The US Grant Hotel

326 Broadway
San Diego, CA 92101