Urban Renewal/Beautification and NIMBYism to an extent killed both trailer parks and single occupancy units.
I'd also note the death of the boarding house between 1920 and 1970 as another issue contributing to things.
I'd also note the death of the boarding house between 1920 and 1970 as another issue contributing to things.
Feels like a huge oversimplification to just say "all would be fine if we had trailer parks".