Built in 1941 and 1948

The first two of this trio were built before the outbreak of World War II and the third one at the corner after the war in 1948. These scaled down homes are found throughout the Bay Area. The floor plans are usually the same and the different porches and modest applied decoration add variety to the exteriors. Take some time here to notice the differences and the similarities between the three houses. What is new? What has changed? What remains original to all three houses?