Express Scripts Office and Data Center – Mission Critical

St. Louis, Missouri

This project created a new data center in Express Scripts’ new 4-story office building. The project required detailed collaboration with core & shell architect (Lamar Johnson Collaborative), the tenant improvement architect (NELSON) and Clayco, to deliver the data center on a very accelerated schedule.

This data center project consisted of 13,500 square feet of total area including approximately 6,000 square feet of white space. The mechanical and electrical systems were designed to achieve a concurrently maintainable infrastructure for 150 watts per square foot power density; half of the area was built-out as part of the initial construction.

One 1,000 kW and one 2,500 kW diesel generator were installed as part of the initial construction, with provisions for a future 1,000 kW generator. The generators were installed in outdoor, walk-in enclosures. Two 600 kVA UPS modules were installed as part of the initial construction, with provisions for a future 600 kVA UPS module. Static transfer switches were installed to create a ‘catcher block’ type architecture to increase energy efficiency.

A stand-alone chilled water system was designed with outdoor air cooled chillers with integral water side economizers for efficient and reliable winter operations. Two 200 ton chillers were installed as part of the initial construction, with provisions for a future 200 ton chiller. The chilled water distribution was as a loop to allow all areas of the piping system to be isolation and drained without affecting the operation of the data center. Computer room AC unit were designed with N+33% redundancy. Building automation system controls were designed to achieve redundancy.

The data center area utilized a 36” high raised floor with early warning smoke detection and a preaction type fire suppression system. All computer room AC units and electrical distribution panels were located outside of the data center in mechanical corridors. Data center heat rejection included hot aisle containment.

Get In touch

Ryan McGuire

Executive Vice President, Corporate Business Unit Leader & Shareholder


Ed Zemaitis

Vice President of Mission Critical Services

+1 312-948-0711

Alan Lurie

Project Executive, Operations

+1 312-429-0392

Innovation Highlights

LEED CS V2.0 Certified

Key Facts

Project size:  234,000 SF building / 13,500 SF data center / 6,000 SF data center white space
Client name:  Express Scripts
Architect:  Lamar Johnson Collaborative / NELSON
Value:  $70 Million Total Contract / $7 Million Data Center

Integrated Company Involvement




Architecture and Interior Design


Structural Concrete