Predominantly, the architectural object is used to place a coat of arms in the free space under the legs for filling and ornamentation. For heraldry, it is more important that it is represented in the coat of arms. The building part in the coat of arms is mentioned in the blazon and should then also be appropriately acknowledged by the coat of arms' painter.
The architectural element typically serves as a backdrop for placing a coat of arms in the empty space beneath the legs, providing aesthetic appeal and decoration. In heraldry, it's more significant that the structure is represented within the coat of arms. The building aspect mentioned in the blazon should also be acknowledged by the artist responsible for creating the coat of arms.