sentences:  The houses in the district represent the variety of architectural styles seen in Monticello from 1870 to 1948, the ages of the oldest and newest houses.The oldest houses in the district are designed in the Gothic Revival and Queen Anne styles.In the early 20th century, Monticello experienced an economic boom due to growth in agriculture and the local patent medicine industry; its newly wealthy residents built homes on State Street, which became known locally as "Millionaire's Row".