CitiMortgage Data Center

O'Fallon, Missouri

The project utilized several new methodologies, including a thin-brick system fascia and an underfloor heating and cooling system.

Clayco provided design-build services for CitiMortgage’s 515,000-square-foot office building and processing center. The building consolidated Citigroup’s St. Louis area-based CitiMortgage operations into one location.

The building includes a centrally located 15,000 SF Tier III, N+1 mission critical data center to support CitiMortgage’s critical business operations. Reliability and systems capacities include redundant primary electrical services; dual telecommunications services and mirror riser closets; two 2,000kW primary service standby power units to carry the entire facility for extended outages; twelve 30-ton CRAC units (redundant service) within the data center; a 750kW dual parallel UPS system and PDUs.

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

Shelby Gardner

Vice President of Mission Critical Operations

+1 314-591-4486

Key Facts

Project size:  15,000 SF
Client name:  Citigroup
Architect:  Lamar Johnson Collaborative


Tilt-Up Concrete Association (TCA) Tilt-Up Achievement Award – 2004
Concrete Council of St. Louis – Quality Concrete Award