Another of Portland’s stunning mid-19th century commercial blocks is the Thompson Block, built in 1868. The structure is one of the most high-style commercial buildings in Maine and is in a great state of preservation. The building was designed by George M. Harding, a VERY busy architect after the disastrous Great Fire of 1866, which destroyed much of Downtown Portland. The building stands three-stories tall with a polychrome slate mansard roof providing a full fourth floor, a subtle and great way to get extra height without making a building too overbearing. The mansard is broken up at the facade by dormers with round-arch windows and keystoned and eared hoods. If only all cities held off urban renewal, we would have so many more structures like this!