Rare 1.02-acre estate parcel in the prestigious St. Martins section of Chestnut Hillofficially subdivided into two buildable 0.51-acre RSD-1 single-family lots. This extraordinary property at 530536 W Moreland Avenue offers unmatched flexibility: build one signature estate residence spanning the full acre, or build two custom single-family homes, one on each approved half-acre lot. Both lots are recognized by L&I and may carry distinct addresses (530 and 536), offering immediate planning clarity. This premier location is among the most coveted in Chestnut Hilla quiet, tree-lined residential pocket known for its stately homes and walkability. From this address, enjoy effortless access to the Philadelphia Cricket Club, Springside Chestnut Hill Academy, Wissahickon Skating Club, Valley Green/Wissahickon trails, and the vibrant shops and restaurants of historic Germantown Avenue. Properties of this size and pedigree rarely come to market in Chestnut Hill. The former residence has been demolished, leaving a clear and ready development site. A grandfathered existing garage remains in the rear corner of the 536 sidea valuable zoning advantage that allows a larger garage or accessory dwelling unit (ADU) to be built with reduced setback restrictions. Included for buyer review are conceptual architectural elevations created by Cuningham Architects, illustrating both (1) a single estate home spanning the full acre, and (2) two smaller homes designed for each half-acre lot. These designs are optional and provided for inspiration only. The architect is available to work directly with the buyer to customize or complete full plans, or buyers may bring their own architect and builder. A recommended builder is available upon request, though buyers may choose any team they prefer. The subdivision has been formally approved by Philadelphia L&I. Zoning: RSD-1 (Single-Family Residential). Survey, zoning permit, easement documentation, and Sellers Disclosure are available.