Buildings　that　are　designed　with　aggressive　energy　performance　targets　are　defined　broadly　in　this　study　as　high-performance　buildings.　As　the　technology　advances,　some　of　these　buildings　have　the　potential　to　become　zero-energy　ready　through　the　adoption　of　cost-effective　measures,　such　as　retro-commissioning　and　occupant　behavior　techniques.　This　study　demonstrated　the　viability　of　an　office　building　to　achieve　the　zero-energy　goal　and　intended　to　engage　the　owners　of　similar　facilities.　The　case　building　was　designed　as　a　very　low-energy　building　with　an　energy　use　intensity　(EUI)　goal　of　42　kWh/(m(2)　a),　and　the　actual　EUI　was　23.9　kWh/(m(2)　a).　The　calibrated　simulation　approach　was　employed　in　the　study,　and　the　results　indicated　that　the　case　building　can　achieve　the　zero-energy　goal　by　optimizing　the　controls　of　the　HVAC　(Heating,　Ventilation　and　Air　Conditioning)　system,　changing　the　occupant　behavior　and　improving　the　performance　of　the　photovoltaic　system.