Fig. 1: Layout diagram and current preservation status of the Sunjialou Cultural Relic Building in Nanyang City.

a Layout diagram: ①north inverted seat, ② south inverted seat, ③ gateway, ④ north flanking hall of the first courtyard, ⑤ south flanking hall of the first courtyard, ⑥ through hall, ⑦ north flanking hall of the second courtyard, ⑧ south flanking hall of the second courtyard; b Decay of eave purlins and rafters; c Decay of eave purlins and rafters; d Insect infestation of eave purlins; e Insect infestation of eave rafters; f Decay of column bases; g Decay of column bases.