Built in 1903 for William Francis Carsley, a wealthy merchant, this historic mansion is part of the prestigious Golden Mile Mansions. Located in the heart of the Golden Square Mile, directly across from the Swiss consulate, it combines noble heritage with modern comfort. Carefully restored, including a solid wood staircase that required several months of work and brass cremone bolts imported from Italy, it also features Napoleon gas fireplaces. With a separate entrance, private parking, a backyard, and multifunctional zoning, it is suitable for both a family home and professional or institutional use. Constructed in 1903 for William Francis Carsley, a prosperous merchant of the time, this historic mansion stands out among the prestigious homes of the Golden Mile, symbols of refinement and prosperity of Montreal's high society in the early 20th century. This exceptional residence, combining noble heritage and contemporary comfort, embodies both prestige and timeless elegance. Ideally located in the heart of the Golden Square Mile, directly across from the Swiss consulate, it boasts a prestigious address and remarkable visibility, in close proximity to institutions, parks, and metropolitan services. The current owners have made significant investments to preserve the authenticity of this residence while adapting it to modern standards. The complete restoration of the solid wood staircase, carried out by a specialized cabinetmaker, required several months of meticulous work to restore this masterpiece to its full glory. The moldings, woodwork, cherry wood frames, and new mantels have been crafted with the utmost care. The natural gas Napoleon fireplaces, integrated into the living rooms and boudoirs, add warmth and refinement. Finally, the addition of brass cremone bolts imported from Italy enhances the noble and authentic character of the property. This mansion also stands out for its rare practical features in this area: a separate entrance allowing independent access to certain spaces, private parking, and a backyard, a true oasis in the heart of the city. Moreover, its multifunctional zoning opens the door to multiple uses: prestigious family residence, high-end professional offices, law firm, private clinic, or distinguished institutional space. A true symbol of the Golden Square Mile, this mansion, a witness to Montreal's history for over a century, combines architectural heritage, modern comfort, and versatile use, making it a unique and lasting investment in the heart of Montreal.