As far as I understand it, retrofits were only forced on commercial landlords, co-ops, and condominium buildings. Private home owners weren't forced, but there'

As far as I understand it, retrofits were only forced on commercial landlords, co-ops, and condominium buildings. Private home owners weren't forced, but there's incentives and tax relief for improving the energy efficiency of your house instead. New construction, apartment buildings and single-family homes alike, all have to abide by the same updated rules.