Yuchanglou (裕昌樓) is a five-storey tulou located at Nanjing County, Shuyang Town, Xiabanliao Village. It was built in 1308 Yuan dynasty by the Liu family clan. It is one of the oldest and tallest tulou in China. Yuchanglou has been nicknamed the "zigzag building", because the vertical wooden post structure is not straight and perpendicular, but zigzags left and right. It was built that way due to an error measuring the building materials. But in spite of this apparent infirmity, this tall tulou withstood 700 years of natural elements and social turmoil. Yuchanglou's outer ring is 36 m in diameter and boasts five storeys, with 50 rooms on each floor.
Each of the 25 kitchens on the ground floor at the back half of the circle has a private water well beside its stove. This is the only tulou in all Fujian with such convenient water supply.
There was a one storey inner-ring house surrounding the ancestral hall as late as 2003. This part of the building stood nearly 700 years intact until, unfortunately, it was dismantled after 2003.