Perfectly positioned within the  landmarked Henderson Place Historic District, 148 East End Avenue is a rare  18' x 35' townhouse that blends architectural pedigree with a meticulous, top-to-bottom modern renovation. Set along one of the most storybook corridors of the Upper East Side-steps from  Carl Schurz Park, the East River Promenade, and quiet, tree-lined blocks known for their timeless brick and brownstone facades-this home offers an atmosphere that feels both exclusive and deeply residential. Inside, the residence has been  fully reengineered with new wiring, plumbing, and  central air throughout, all while preserving the elegance of its original period details. Nearly every  window and door is custom, double-glazed, and crafted to Landmark specifications, framing serene views and providing exceptional quiet. Multiple  working fireplaces bring a sense of warmth and authenticity rarely found in newly renovated homes. Adding to its uniqueness, this is the  only house on East End Avenue with a permitted fifth floor, thanks to its grandfathered attic-a remarkable advantage that allows for a sunlit studio, library, or private retreat. A once-in-a-generation offering in one of Manhattan's most cherished historic enclaves.