The Italianate style in architecture was first developed in Great Britain in the early 19th century. It drew its inspiration from the vocabulary of 16th-century Renaissance palaces and villas. Typical features include loggias and belvederes, quoins, arched or pedimented windows, and projecting eaves and cornices supported by decorative corbels. From the late 1840s to the 1880s the Italianate achieved great popularity in the U.S., where it was promoted by architect Alexander Jackson Davis. Web resources here and here.

Charles Barry. The Reform Club, London. 1837-41.