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Evolution of building
CITY	FARM
Cave house BC300
High-floor BC300-AD300	Rectangle house before AD700
warehouse before AD300	Town house before AD1200-1700
Pre-palace AD600-600	Farm house AD1600-1700
Palace AD900-1000	Two-story Town house before AD700
Noble House AD1200-1300	Farm house before AD1800
Studio Ad1700	Farm house before AD1800
Western Ad1800	Town house before AD1800-1900