The article mentions that the houses were often razed because the land was more valuable than the building. I don't know about the parts that were enamel coate

The article mentions that the houses were often razed because the land was more valuable than the building. I don't know about the parts that were enamel coated, but I imagine some of the cost might be recouped from recycling the steel. I don't think I've lived in a building newer than this era since I was a child, and I've moved quite a bit in both brick and wood framed houses in the Midwest US.