Agreed on the structure part. Wet or saturated soils will have a considerable amount of weight.
Pike's is okay, but not great as it used to be. Besides, this isn't Seattle. No reason to model after it. This is more like a Chimacum Corner place.

BTW, rooftop greenhouses and gardens have also been shown to be improvements on habitats for honeybees; in our case, for Bombus- bumblebees.