401 Wiegerstown Road A rare find in O'Fallon: This spacious 4-bedroom walkout ranch delivers over 3, 000 sq ft on the main level, an exceptional layout seldom available in the top-rated O'Fallon School District. Perfectly positioned on a quiet cul-de-sac and backing to one of O'Fallon's hidden local parks, this home offers unmatched privacy, green views, and convenience for buyers seeking proximity to Scott Air Force Base, I-64, shopping, dining, and everyday amenities. Designed with a highly desirable split-bedroom floor plan, the home features 4 full bathrooms and a massive unfinished walkout basement already equipped with a full bath-ideal for a future 5th bedroom, home theater, gym, workshop, or second family room. Inside, real bamboo hardwood flooring flows through the main living areas, complemented by durable vinyl in all baths. A welcoming foyer opens to a formal dining room and an oversized family room with vaulted ceilings and a gas fireplace. The open, entertainment-ready kitchen includes stainless steel appliances, a breakfast bar, sunny breakfast nook, and a large walk-in pantry. A versatile second living space/den sits just off the kitchen and provides direct access to the private primary suite, which includes a generous walk-in closet, double vanity, soaking tub, and separate shower. Three additional guest bedrooms occupy their own wing with convenient access to two full bathrooms. Everyday functionality shines with a 3-car garage, dedicated laundry room, and practical drop zone. Outside, enjoy an expansive deck overlooking the park, with stairs leading to the backyard and the incredible potential of the walkout lower level. This home combines location, square footage, privacy, and future expansion potential-a truly rare opportunity in O'Fallon.