I can't decide if I love this house or if I hate it. Pasting from the real estate listing:
Techbuilt model home by architect Carl Koch defines mid-century modernism. One of 12 homes featured on the Lexington Historical Society modernism tour. Versatile design w/ option for expansion/change. Upstairs family room was 2 additional bedrooms and can easily be restored back. Set high on a knoll, 3/4 acre wooded/private lot in area of more expensive homes. Deep 1 car garage w/ loft has heater. Neighborhood pool, Estabrook school, Lexpress @ driveway.
I like the design, but it looks like it would be hard to make any changes without ruining the character of it. I like the setting (no lawn to mow!) but I don't like that it's about 100 meters from a major Interstate highway. I like that it's cheaper than other houses in the neighborhood, but that isn't saying much (and, bleh, suburbs).
Pasting from the Wikipedia entry on Carl Koch:
He was born Albert Carl Koch in Milwaukee, Wisconsin. He was educated at Harvard College and received his Master of Architecture degree from the Harvard University Graduate School of Design. He completed his studies in 1937. The time he spent at Harvard overlapped with arrival of Walter Gropius, founder of the Bauhaus in Germany.
After completing his education, he moved to Sweden where he worked for Sven Markelius for six months. There he blended what he had learned in his formal education with clean Scandinavian design. These influences were evident in his work, especially the Techbuilt homes.
Koch believed that the American lifestyle would be best served by a housing system which could be easily assembled, disassembled and reconfigured. This passion led him to pioneer prefabrication technologies. His Techbuilt series of homes was designed to be built with prefabricated panels for the walls, floor and roof. 
His prime legacy is the Techbuilt system of home construction. In the Techbuilt house, the master bedroom is upstairs while the other bedrooms, kitchen and living space are all on the first floor. 
• Snake Hill, Massachusetts group of eight houses (1942) 
• Acorn House (1948)
• Staff housing for the US Embassy, Belgrade (1956)
• The Techcrete Academy Homes (1962)
• Eliot House, Mount Holyoke College (1962)
Carl Koch is known for his successful early designs for prefabricated housing. He created the Techbuilt System of home construction. Progressive Architecture magazine gave him the unofficial title "The Grandfather of Prefab" in 1994.  In total, over 3,000 Techbuilt homes were sold.  He outlined his thoughts and experiences on prefabrication in a book which he wrote with Andy Lewis entitled At Home With Tomorrow (NYC: Rinehart Rinehart and Company, Inc., 1958.)
• First Award American Institute of Architects (1954)
1. ^ "Carl Koch". National Trust for Historic Preservation. http://www.preservationnation.org/travel-and-sites/sites/northeast-reg ion/new-canaan-ct/architects/carl-koch.html. Retrieved 15 November 2009.
3. ^ Ford, Katherine (1955), Designs for living; 175 examples of quality home interiors., New York: Reinhold Pub. Corp., pp. 22–23, http://hdl.handle.net/2027/mdp.39015006327749
4. ^ Ford, Katherine (1955), Designs for living; 175 examples of quality home interiors., New York: Reinhold Pub. Corp., pp. 22–23, http://hdl.handle.net/2027/mdp.39015006327749
5. ^ Gutheim, Frederick (1957), One hundred years of architecture in America, 1857-1957, celebrating the centennial of the American Institute of Architects., New York: Reinhold Pub. Corp., http://hdl.handle.net/2027/mdp.39015006723400
7. ^ "Carl Koch". National Trust for Historic Preservation. http://www.preservationnation.org/travel-and-sites/sites/northeast-reg ion/new-canaan-ct/architects/carl-koch.html. Retrieved 15 November 2009.