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Cornerstone Building Services, Inc. (CBSI) is a full-service building restoration company based in Washington, D.C., providing quality on-demand repair and scheduled maintenance services to multi-family units, commercial properties, historic buildings, and government facilities. For over 20 years, CBSI has been the go-to company for property managers and building engineers who need to address moisture-related problems, restore building facades, and tackle complex, multi-faceted projects.