8211 Gannon Avenue Built in 1948 and transformed by a 1991 addition that doubled its footprint, this Oakbrook Forest ranch delivers a scale almost never found on one level: 8, 006 total finished square feet on nearly half an acre in University City, minutes from Clayton and I-70. Six bedrooms, three full and four half baths, two full kitchens, and an oversized 3-car garage with rear entry. Five bedrooms sit on the main level, including a primary suite with its own sitting room/office, whirlpool bath, double sinks, and separate shower, plus a small adjoining room that works as a nursery or second walk-in closet. The main floor also holds the living room, separate dining room, family room with woodburning fireplace, a 15x16 eat-in kitchen with custom cabinetry and solid surface counters, and a laundry/mudroom. Front and back staircases. A sixth bedroom or private office occupies the second floor. The finished lower level is the surprise: a 25x47 bonus room with exercise platform, previously built out as a professional audio and video production studio, plus a second full kitchen opening to its own 36x15 recreation room, two half baths, and a second laundry. It functions as genuinely separate living space. Three independent HVAC systems. A 200 sq ft cedar-lined closet. Built-in bookcases, walk-in closets, bay and atrium doors, in-ground sprinkler system, screened in porch. The expensive items are already handled: complete roof replacement in 2023, new water heater, new dishwashers.