Formerly the pilots’ barracks during Japanese occupation, this building became the national military petty officers’ dormitory after the War. At the very beginning, the interior was parted into 26 households using sugarcane partitions and accommodated more than 100 people in its prime time. Since children grew up and living space demands were raised, residents started to augment and/or modify its interior by adding attics upwards, expanding kitchens, toilets and bedrooms outwards, resulting in a “houses within a building” phenomenon. Building D is the most fully preserved barrack architecture in Hu-Wei Jian Guo Village today, and it has witnessed two generations. Cross-group spatial imprints are most valuable for being preserved.