Tutor Perini Corporation (formerly Perini Corporation) is one of the largest general contractors in the United States as a result of the merger of Perini Corporation and Tutor-Saliba Corporation in 2008. At the end of 2013, it reported annual revenue of approximately $4.2 billion. Tutor Perini is headquartered in Sylmar, California, and works on construction projects throughout North America. Specific areas of focus are civil infrastructures such as bridges, highways, tunnels, airports, and mass transit systems, building infrastructure (healthcare, education, municipal government, hospitality and gaming, multi-use, office towers, multi-unit residential towers, high-technology projects), and specialty contracting (electrical, mechanical, plumbing, heating, air conditioning and ventilation (HVAC), fire protection systems, concrete placement).