Abstract Building aerodynamics is a vital interdisciplinary field that investigates the interactions between wind flow and building surfaces. In this study, flow structures around three building models with a 30° slope-10 cm × 5 cm × 5 cm, 5 cm × 5 cm × 10 cm, and 5 cm × 5 cm × 5 cm-were experimentally analyzed using Particle Image Velocimetry (PIV). Instantaneous velocity fields were measured, and time-averaged velocity distributions ⟨V⟩ and streamlines ⟨ψ⟩ were computed. The results show that wind separation at edges and corners generates recirculation zones along façades, side walls, rear, and roof regions, with elevated turbulence in the shear layers. Boundary layer thickness decreases toward the side edges, shortening downstream separation regions, while high turbulent kinetic energy is concentrated in wake vortices. Rotation of elongated building models significantly enlarged the wake vortices and influenced surrounding flow, whereas rotation of the cubic model had negligible effect. These findings highlight that building orientation strongly affects wake formation, particularly for elongated geometries.