Exclusive luxury apartment for renovation*, located on the third floor in the prestigious Castellana neighborhood, between the iconic streets of Serrano and Hermanos Bécquer—one of the most sought-after areas in the prime real estate market.Set within an elegant classical building, the property offers 241 sqm of built area and stands out for its exterior orientation, desirable south-facing exposure, and impressive 3-meter-high ceilings, enhancing the sense of space, light, and architectural grandeur throughout. The abundance of windows and the absence of load-bearing walls provide complete flexibility to tailor the layout to individual needs, making it an ideal canvas for a bespoke residential project.Currently in need of renovation, the property presents a unique opportunity to design a home to the highest standards of comfort and sophistication. In addition, several refurbishment proposals are already available, allowing for different layout options, including a configuration with four spacious en-suite bedrooms, a guest powder room, and an expansive open-plan living area designed to maximize natural light and spatial flow.The building offers the amenities expected of a representative classical residence, including dual lifts, concierge service, central heating, a service staircase, and well-maintained interior patios.A rare opportunity to create a fully customized luxury residence in one of Madrid's most prestigious addresses, combining classical architecture, prime location, and outstanding potential for value appreciation. *Images shown are architectural renderings based on available design projects and are provided for illustrative purposes only.