This is an absolutely stunning, one-of-a-kind, organic modern home designed by the home's original owner, Robert Rasmussen. Bob was an apprentice to Frank Lloyd Wright for a time, and took Wright's teachings about organic architecture to heart, as evidenced by this amazing mid-century modern home. Built primarily of uncoursed limestone and glass, the home features very few right angles, Rasmussen opting instead for graceful curves that sweep the house along its lot, partially set into the ground upon which the house was built, making it appear as a rocky outcropping on the terrain. Inside, wonder and delight abound, as you're surrounded by what seems like acres of walnut used for cabinetry, paneling, built-in furniture and trim, volumes of main-level storage, a feature fireplace, built-in and custom-designed furniture, a round kitchen still showcasing some original appliances and gorgeous original tile, and so much more. Down the hallway to the private areas of the home, a twin convertible bedroom features mirror-image sleeping rooms, built-in desks & wardrobes, followed by a Primary Suite with an absolutely incredible en-suite bathroom with sunken, terrazzo tub/shower and more original tile, fixtures & finishes. A study / fourth bedroom sits at the end of the private wing, and throughout the house, endless windows - with their original Knoll fabric window treatments - follow the curves of the house from front to back, and along the covered patio area outside. A beautiful, gently-rolling lot cradles the home, with mature trees along the perimeter on two sides, and more peppered throughout. Saved from possible destruction after the architect / owner passed away by neighbors who are mid-century modern architecture fans and preservationists, the home is now available for the first time ever on the public market to whoever desires to be the next stewards of this fantastic residence - complete with original plans, style guide created by Bob and his wife, June, and more. The lower level features the 2-car garage and plenty of flexible finished space including a large rec room with a curved bar and an alcove that could be used as a bar, TV area and more; remodeled powder room; and workshop / studio space. Additionally, you'll find a wine cellar or storage area, and another storage room (originally designed as a tornado shelter). The home features new HVAC systems as of 2024, and numerous other important and valuable recent updates. Located across the street from the prestigious Old Elm Club, and just a 1/2 mile from the Metra station, Openlands Lakeshore Preserve, Fort Sheridan Forest Preserve and the Robert McClory Bike Path, just 5 minutes from Lake Michigan, and served by highly-rated Lake Forest schools, this is indeed a rare opportunity to purchase such a remarkable residence in a beautiful setting & neighborhood, and with so much so close by. The property is being sold as-is including original and custom furniture pieces.