Premise: Known locally as ca' (short for casa) as well as palazzo, the marble, brick, and white limestone palaces range over 600 years from Venetian-Byzantine to Renaissance, Baroque, and Neoclassical, but most of them are exotically 14th- and 15th-?­century Gothic, Venice's trademark in architectural styles.

Hypothesis: The palaces were mainly built in the 20th century.
Relation: contradiction