Which feature is NOT part of Chiswick House's architectural design?

Chiswick House is a significant example of Palladian architecture, which is characterized by elements such as symmetry, classical proportions, and the use of columns and pediments. While Baroque architecture is known for its dramatic use of space and elaborate ornamentation, Chiswick House embodies a more restrained and balanced aesthetic typical of Palladian design.

The inclusion of Corinthian columns contributes to the classical feel of the building, while the octagonal central space reflects the influence of ancient Roman structures, and lateral double staircases create a grand entrance that enhances the building's overall symmetry and elegance. Therefore, Baroque elements do not align with the architectural vocabulary present in Chiswick House, making it the correct answer for the feature that is not part of its design.