Welcome to 3515 St. William Lane, a two-story home in Rolling Green zoned to Katy ISD featuring 3 bedrooms, 2.5 baths, and an estimated 3,300 sq ft of living space, including 2,472 sq ft per HCAD plus an 828 sq ft rear flex addition not reflected in the tax records. This unique feature offers versatility for a game room, gym, office, or second living area while still leaving ample yard space in the backyard. Built in 1996, the home sits on a 7,998 sq ft lot and includes a two-car garage, spacious living and dining areas, and a comfortable primary suite. The open layout is ideal for entertaining, and the property features a wood-burning fireplace, brick exterior, and fenced yard. While it offers equity-building potential with deferred maintenance, it represents an excellent opportunity for buyers seeking a larger home at a competitive price point with easy access to highways, shopping, dining, and neighborhood amenities.