Founded in 1986 in Atlanta, Ga., Keystone Concrete Foundations Inc. is a masonry contracting firm. Based in Alpharetta, Ga., it specializes in poured concrete walls for both commercial as well as residential projects in the southeastern United States. The firm has contributed to various projects, including Greison Trail Apartments, University Medical Center Patient Tower Addition, Greystone Summit Apartments, Park Place Senior Village, Park Place Senior Village Bridge Walls and an array of various other residential foundations.