Tools and strategies for transition
There are excellent historical models of large-scale industrial and other district uses integrated into urbanism. Here are two Google Earth shots – the first of an area of East Portland, which is essentially flex industrial. Note the depressed freeway and rail line adjacent, with the small-block street grid continuing overhead (at a larger spacing – more like 1200′) . The second is in Northwest, adjacent to the freeway which is also depressed along most of its length (although not here). Where larger users come along, they bridge or tunnel across rights of way – for example, the large multi-block campus of Good Samaritan Hospital, at upper left of the second pic) or in exceptional cases, get vacations of them (which can later be reclaimed, in theory).