National Scope. Local Expertise. The Alter Group, celebrating more than 50 years in business, is one of the nation's preeminent corporate real estate development firms. Founded by William A. Alter in 1955, The Alter Group has developed close to 100 million SF of speculative projects for its own portfolio and build-to-suit facilities for corporate users. This year, the company has 6,700,000 SF of space, worth $796,000,000, under development in growth markets across the nation. Additionally, The Alter Group owns 18 business parks nationally, and 1,500 acres of vacant, improved land for future development. The firm ranks #5 in the National Real Estate Investor survey of America's top office developers.