Building One Services Corp. and Group Maintenance America Corp. have signed an agreement to merge two of the largest facilities services companies in the U.S. The combined organization will be the largest company in the industry with combined revenues of over $3.2 billion. The combined company, with over 27,000 employees, will have operations in over 250 locations nationwide, providing mechanical, electrical or janitorial services in all of the top 100 U.S. markets. The combined company will be able to provide all three of its services in 43 of the top 100 markets.