This one-of-a-kind brownstone in Harlem's iconic Mount Morris Park Historic District isn't just a residence; it's a work of art crafted by the legendary architect John Hauser, whose influence on the Renaissance Revival style remains unparalleled. Built around 1900, this landmarked masterpiece unfolds over four grand stories, with an expansive footprint of approximately 5,600 square feet. Its 20 foot wide facade, paired with Hauser's distinctive extensions at the front and back, create an impressive sense of space and elegance that is rarely found. Every inch of this architectural gem reflects Hauser's signature attention to detail, where timeless design meets historic charm. From the moment you enter, you're greeted by a seamless blend of original craftsmanship and modern updates, with intricate millwork, gleaming hardwood floors, and exquisite moldings that tell a story of a bygone era. The ornate fireplaces with custom-carved mantles serve as captivating focal points, while exposed brick walls and sunlit rooms evoke a sense of warmth and sophistication throughout. The outdoor spaces are just as remarkable, with a serene patio and a lush, landscaped garden that invite you to unwind in your own private oasis. Imagine al fresco dinners under the stars or morning coffee surrounded by greenery-right in the heart of the city. This property offers unparalleled flexibility. For those seeking an owner-occupied sanctuary, the spacious duplex provides an elegant, comfortable living space while allowing you to generate significant income from the three additional rental units. Alternatively, investors can maximize returns by leasing out all four apartments, tapping into Harlem's strong rental demand. The ground-level duplex exudes sophistication with its generous layout, featuring two beautifully designed bedrooms and 2.5 bathrooms. The flowing floor plan creates a perfect balance between private quarters below and open entertaining areas above, with direct access to your personal garden retreat. A charming balcony extends off the second level, offering a quiet escape that overlooks the backyard. The upper units mirror the building's grandeur, each meticulously crafted with spacious living areas. These units offer a blend of studio and one-bedroom configurations that cater to modern living while paying homage to Hauser's classic architectural vision. Each apartment is individually metered and boasts its own central heating and cooling system for ultimate convenience and energy efficiency. Every kitchen is designed with both style and functionality in mind, featuring full-size appliances, including a refrigerator, stove, dishwasher, microwave, and an in-unit washer and dryer-ensuring that contemporary comforts are at your fingertips. This historic brownstone, with its rich legacy shaped by John Hauser's renowned design, is more than just a home-it's a rare opportunity to own a piece of Harlem's architectural heritage. Whether you're drawn by the charm of living in a historic treasure or the prospect of an exceptional investment, this property stands as a unique offering in one of New York City's most beloved neighborhoods.