The late-20th century big box store is also not really a structure designed to last more than a few decades at most. They usually get torn down because they are

The late-20th century big box store is also not really a structure designed to last more than a few decades at most. They usually get torn down because they are at end of life and it is cheaper/easier to demolish than invest significant sums. Enclosed malls have a better shot because they were built with (slightly) higher quality, but none of the strip mall boxes are worth saving.