Dupont Fabros Technology, or DFT, is a real estate investment trust engaged in the design and operation of multitenant, wholesale data centers in metropolitan areas across the United States. The company provides the space and infrastructure, such as electrical power, security, and fire suppression services for customers to operate their servers and computing equipment. Its real estate portfolio is composed of large data centers located in the Northern Virginia, Chicago, Greater New York City, and Santa Clara, California areas. DFT derives the majority of its income in the form of rental revenue from tenants in short- to medium-term lease agreements. The company's major customers are technology companies, including Microsoft, Facebook, and Yahoo, which account for most of its revenue.