Seismic Evaluation of Existing Buildings provides a three-tiered process for seismic evaluation of existing buildings to either the Life Safety or Immediate Occupancy Performance Level. Design professionals will learn how to determine whether a building is adequately designed and constructed to resist seismic forces. All aspects of building performance are considered and defined in terms of structural, nonstructural, and foundation/geologic hazard issues. The design of mitigation measures is not addressed in this Standard. ASCE/SEI 31-03 is intended to replace FEMA 310, Handbook for Seismic Evaluation of Buildings—A Prestandard (1998). This Standard was written to: reflect advancements in technology; incorporate the experience of design professionals; incorporate lessons learned during recent earthquakes; be compatible with FEMA 356, Prestandard and Commentary for the Seismic Rehabilitation of Buildings (2000); be suitable for adoption in building codes and contracts; be nationally applicable; and provide evaluation techniques. This Standard serves design professionals, code officials, and building owners looking to evaluate the seismic existing buildings.