Remnants of Boise Tour - This resource could be the most useful. It features images of historic areas throughout Boise. It includes both current images and older ones, and it lays everything out as a map. However, students may need to take screenshots to create images for some of the modern buildings.
Idaho State Archives - Search "Buildings AND Boise" The Idaho State Archives offers a selection of historic photos of buildings; however, not all of the buildings it includes are still around.
Old Boise - Then and Now Section - This website features photos of historic building
National Register of Historic Places Do a search for Idaho, Ada county. This resource features high-quality, historic photos that are primarily of buildings. However, it doesn't offer modern comparisons for those buildings.
Google Maps - Use in Street View. Once you find a building, take a screen shot.