Possible, but anecdotally I know tons of boomers with multiple properties, but I cannot say the same for previous generations and generations that came after the boomers. This is why I suspect that novel research in the area would show that rent seeking, especially from housing has risen.

Another issue that may be contributory to rising house prices are divorce rates, which skyrocketed since the early 80s. A divorce almost always results in the occupancy of two residencies per family.