PRICE IMPROVEMENT! Sellers have significantly repositioned the price, creating an exceptional opportunity to own this end-of-cul-de-sac Diamond Bar home on over 1/3 acre (16,742 sq ft) with a large usable lot and ADU potential. Private setting with a long driveway, impressive curb appeal, ample parking, spacious side carport, and mature palm trees. The oversized lot offers endless possibilities for an ADU, pool, future expansion, or estate-style living. Located in the award-winning Walnut Valley Unified School District, within walking distance to Maple Hill Elementary, Chaparral Middle School, Maple Hill Park, and just minutes from Diamond Bar High School. Lovingly maintained by the same owner for over 40 years, this bright home features high ceilings, fresh interior paint, hardwood and tile flooring, recessed LED lighting, wood shutters, many upgraded dual-pane windows, central A/C and heat, tile roof, ADT alarm system with 12 sensors, and Crimsafe stainless steel security screens on select doors and windows. Functional floor plan with formal living room and separate family room with fireplace open to the kitchen, ideal for everyday living and entertaining. Granite countertops, remodeled downstairs bathroom, separate laundry room, and attached garage with direct kitchen access. Spacious primary suite with large closet, dual sinks, and oversized shower. French doors and a sliding glass door provide seamless indoor-outdoor living. The backyard features a wide covered patio, numerous mature fruit trees with abundant yearly harvests, and plenty of space to relax, entertain, or customize to your needs. Outstanding value and a rare opportunity to own a versatile property with tremendous potential in one of Diamond Bar's most desirable neighborhoods.