This study evaluates whether a newly constructed mixed-use industrial–administrative facility in Kosovo, with an approximate gross area of 9,000 m², achieves near-zero energy building (NZEB) status under Kosovo’s Energy Performance of Buildings framework and quantifies its LEED v4 BD+C certification outcome. The analysis integrates iSBEM operational-energy simulation, PVsyst v7.2.11 photovoltaic yield modeling using Meteonorm 8.0 climate data for Pristina, Kosovo, and a fully verified LEED scorecard. The 540 kWp roof-integrated PV array, consisting of 1,200 Longi Solar modules over an area of 2,608 m², yields 679.1 MWh/yr with a performance ratio of 83.73% and a specific production of 1,258 kWh/kWp/yr. The building attains a Renewable Energy Ratio of 95.1%, a net grid draw of 3.64 kWh/m²·yr, and EPC Class A performance, with 20 kWh/m²·yr and 22 kgCO₂/m²·yr, displacing 17,546 t CO₂ over 25 years against Kosovo’s carbon-intensive grid, which has an emission factor of 1,220 g CO₂/kWh. LEED Gold certification was awarded, with a score of 73/110, equivalent to 66%. The strongest performance was achieved in the Energy and Atmosphere category, at 88%, while the weakest performance was observed in the Location and Transportation category, at 19%. This is the first published dual EPB–LEED Gold-certified NZEB case study from Kosovo, providing a transferable quantitative benchmark for the built environment of the Western Balkans.