Sited on 4.5 PRIVATE ACRES, this brilliantly designed Beaux Arts mansion is poised for completion. New Owners will create their own INTERIOR STYLE whether Traditional, Transitional or Contemporary. The unfinished residence presents a unique opportunity to transform OVER 23,000SF of potential living space into a timeless landmark. 333 Foster is being sold "as it is" with the final design, finishes and associated costs to be completed by the Buyer. With concrete construction, a full 4" cut limestone exterior, Vermont slate roof, unparalleled formal and informal areas, multiple terraces, 11 GEOTHERMAL WELLS for heating and cooling, 4 LEVEL ELEVATOR and INDOOR SWIMMING POOL, it is extraordinary! The plan notes a minimum of 6 bedrooms with 2 POSSIBLE MASTER SUITES, 8 full & 6 half baths and a 6-car garage. CAR ENTHUSIASTS have potential additional space for collectible cars accessible via an outdoor ramp to lower level. East location near the Onwentsia Club, Lake Forest Country Day School.