MASSIVE $100,000 PRICE IMPROVEMENT!!! Welcome to 1613 N. Erin Avenue, a rare Upland estate set at the end of a quiet cul-de-sac on an expansive lot. The main residence offers four bedrooms and three bathrooms with a functional layout, including a spacious primary suite, with a fireplace, formal dining room, living room, kitchen, and inviting family room. An updated attached two-car finished garage features epoxy floors, built-in cabinetry, and recessed lighting, plus a brand-new water heater for added peace of mind. A beautifully updated guest house/ADU of nearly 1,000 sq ft with high ceilings includes a full kitchen, living room and large bedroom with plantation shutters overlooking colorful bougainvillea , and a stylish bathroom with a walk-in shower — ideal for extended family, guests, or rental potential income. The large private backyard is a true retreat with lush lawn, endless rose bushes, apricot, peach and tangerine trees, mature landscaping, and room to create your dream outdoor oasis. Plenty of room to build a pool. Tall ficus trees along both perimeters of the backyard ensure complete privacy from neighbors. All tucked away in a prime Upland location near top schools, shopping, and dining, and easy access to the 210 and 10 fwys.