The Markley Group, owner of the largest data center and telecom co-location facility in New England, has 400,000 sf of mission critical facility space supporting a variety of organizations such as one of the nation’s largest law firms, premier universities and a major pharmaceutical company.  The facility shares a building with Macy’s department store in Boston’s Downtown Crossing area. Vanderweil designed substantial infrastructure to support data center fit out for multiple tenants with power densities ranging from 50 - 350 w/ft2.  Projects include small footprint caged co-location areas, to high-density suite fit-outs, each with unique, and often substantial, power and cooling requirements, varying from 6 to 20kW per rack. Constructed infrastructure includes paralleled, redundant generators, on-site fuel storage in excess of 80,000 gallons and multiple Uninterruptible Power Supply (UPS) plants, including sustainable, a flywheel-based UPS system, as well as rotary and battery systems.  Further, Vanderweil designed a 5,000-ton redundant chilled water plant for central support of the facility, and has presented schematic design for an additional 6,000-ton plant.