The Gill House at 730 15th is a premier example of Architect Charles Haertling's distinctive use of natural and organic materials combined with modernist elements. Built in 1972, w abundant stone, cedar, copper and glass, 730 15th sits on a 9400 sq ft lot. The theme of indoor outdoor living feels as if it were invented at this property. Blocks from Chautauqua Park, the house makes full use of the large lot and SW light and views, with walls of glass overlooking the gardens and nearby Flatirons.