Tutor Perini Corporation (formerly Perini Corporation) is one of the largest general contractors in the United States. At the end of 2013 it reported an annual revenue of approximately $4.2 billion. Tutor Perini is headquartered in Sylmar, California, and works on many construction projects throughout the United States and Canada. Specific areas of focus are civil infrastructure (bridges, highways, tunnels, airports, 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).