 In the early 20th century, the city continued at a lower level of prosperity, but the level of architectural quality of new Colonial and Classical Revival buildings continued to be high.The effect of this growth is that there is now a high quality cross-section of architectural styles of the 19th and early 20th centuries, including residential, civic, commercial, and religious buildings.The historic district designated in 1991 is about in size, and includes more than 750 historically significant buildings.