The Fuller-Sotheby link above tells us this:
Charles Haertling's Mid-century modern masterpiece, The Menkick House (1970), is attainable for the first time in nearly 30 years. More than a home, this iconic structure is a work of art and arguably Boulder's most important piece of architecture. The design of the four story home flows from the site and it's imposing backdrop of Gyp Rock (Green Rock). The home is located in Boulder's exclusive Knollwood Estates. Just a short walk along the wooded path from the end of the cul-de-sac leads to the heart of Pearl Street and all that Boulder has to offer. Stunning views of the Flatirons, Mt Sanitas, and Red Rock from the Master suite. Three additional bedroom suites cascade down the rock from the main level. Additionally features a family room, media room and art studio/office. Built in the late sixties, the home received a design citation award from the Colorado Society of the American Institute of Architects in 1971. The rock has three separate peaks of different heights, and the homes three stone masses emulate the rock. Each corresponds in size to the peak behind. According to Haertling, horizontal lines were used for the rest of the house to give prominence to the rock. The formal side of the house to the south is joined to the more casual side to the north by a long corridor and the exterior is meant to look as natural as the site using rough lumber and stone. Remodeled in the early 80's by the current owner it has been meticulously maintained since. This is truly a once in a generation opportunity to own an architectural work of art and Boulder's most famous home.