This report provides a narrative of how Pacific Northwest National Laboratorys (PNNL) Laboratory Support Building (LSB) complies with each of the Federal Guiding Principle requirements for sustainable existing buildings within five areas: Employ Integrated Assessment, Operation, and Management Principles; Optimize Energy Performance; Protect and Conserve Water; Enhance Indoor Environmental Quality; and Reduce Environmental Impact of Materials. Specifically, PNNL is exceeding requirements in Executive Order (EO) 13423, Strengthening Federal Environmental, Energy, and Transportation Management and EO 13514, Federal Leadership in Environmental, Energy, and Economic Performance, which both require 15% of an agencys existing buildings and leases meet the Guiding Principles by 2015. Additionally, EO 13514 requires agencies to make annual progress toward 100% of buildings meeting the Guiding Principles. With exceeding the requirements, PNNL currently has about 25% of its buildings categorized as High Performance and Sustainable Buildings (HPSB). The pages that follow document the Guiding Principles conformance effort for LSB at PNNL. The effort is part of continued progress toward a campus building inventory that is 100% compliant with the Guiding Principles. The included documentation is intended to provide a narrative of how the LSB complies with each of the Guiding Principles requirements. These narratives draw from the many sources that are explained in the text and rely on extensive data collection. The descriptions that follow point to each of these sources, providing the reader with specific policies, procedures, and data points.