Evidence that they don't build them like they used to? Looking at Manhattan sales since 2003, average closing prices for pre-war co-ops came in 54% higher than their post-war counterparts. Co-ops sold in buildings dating from 1880s (i.e. The Dakota and hundreds of brownstones) were the most valued. Buildings from the 1950s (dozens of nondescript white- and red-brick buildings) sold at the lowest price points on average.