In brief
The history of the materials explains why the preserved city does not match the original one.
Useful to know
According to UNESCO, Telč's houses were originally wooden. After a fire at the end of the 14th century, the town was rebuilt with stone construction, fortified with walls and supplemented with a network of artificial ponds. [1]
Material change is more essential than the general impression of antiquity. When considering, turn on the city border and the water environment, instead of limiting yourself to the row of houses. The current sequence of facades may be the result of a post-crash makeover.
Sources
For further detail and to check the information: