Create a dark, cinematic horror background score for a short film set in a half-constructed, abandoned building at night. Start with eerie ambient pads, soft wind sounds, and distant metallic creaks. Gradually build tension with low bass drones, subtle whispers, and ghostly synth textures. During phone call moments, add glitchy static, distorted synth notes, and eerie, muffled voices. Use sudden sharp string stabs and quick bass drops for character disappearances. End with deep, reverb-heavy bass hits, reversed effects, and an abrupt silence to leave a chilling impact. Keep it atmospheric, suspenseful, and cinematic.