Guanshi jianzhu, literally translated as official-style architecture, were projects supervised by the Ministry of Works in pre-modern China. The so-called official-style architecture primarily consisted of imperial projects, normally in the capital, such as palaces, imperial-sponsored shrines, temples, monasteries, and imperial mausoleums. After surveying architecture from the Song (960–1279) to the Ming (1368–1644) dynasties, the eminent Chinese architectural historian Liang Sicheng defined the Song official-style architecture as elegant and the Ming (and afterwards) as rigid. His critique in the early twentieth century set the tone for the study of Song and Ming architecture for decades. This lecture will demonstrate how the abrupt transformation of the official-style architecture from the Song through Ming occurred by investigating the diversified regional styles of Yuan (1279–1368) architecture. Thus, we can revisit the accuracy of Liang’s far-reaching labels.