"A highly detailed digital rendering of a four-unit residential building floor plan, viewed from a bird's-eye perspective (top-down). Each unit consists of three bedrooms, a living room, a kitchen, and two balconies. The central feature of the plan includes staircases located symmetrically in the middle of the left and right sides of the building, designed as clearly visible and functional staircase boxes. Walls are represented as solid black for clear definition, and flooring is shown with light grey tones to represent simple ceramic tiles. Minimal focus on material details, and no furniture is included in the design. Maintain a clean, professional, and photorealistic style for an architectural presentation."