What constitutes a single structure? What if multiple buildings are connected via walkways or common space?
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Interstitial Narrow gap between two buildings set back-to-back in Daimyo. | Building, Narrow, Architecture
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terminology - What is the term used to describe the space under a roof that joins two buildings? - English Language & Usage Stack Exchange
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The Spaces between Buildings (Center Books on Space, Place, and Time): Ford, Larry R.: 9780801863318: Amazon.com: Books
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