This ongoing research effort explores the of these typologies due to urbanization driven by E-commerce of suburban building types which require large land commitments, cheap in the suburbs, expensive in the city, to deploy. The traditional Flex Building, elusive to define in detail as markets have subtle variations to the base typology, is typically a 50% office minimum and 50% bay door served maximum building at small square footages not exceeding 150 thousand square feet. Here we have looked at two story and 4 and 5 story iterations of the typical morphology. Discoveries include multiple core needs, issues of effective plans requiring open to weather access and wide corridor needs at all levels among other things.