I already see that happening, except without the Megabuilding. For example, I see lots of semi-permanent food trucks — they park in the same spot every day, run

I already see that happening, except without the Megabuilding. For example, I see lots of semi-permanent food trucks — they park in the same spot every day, running off of bottled propane and a noisy little generator hanging off the hitch, doing brisk business in a busy pedestrian-heavy neighborhood with lots of empty storefronts. This can go on for literally years. On occasion the food truck will become so permanent that it's up on blocks in a parking lot, has a permanent eating area built next to it, maybe even has a cord running into a neighboring business. But that neighboring business is invariably a small business in an old, single-story building. I don't know the cause of this obvious inefficiency. I assume it's that commercial real estate companies don't want to waste their time with small tenants. They figure it's more profitable to leave a large space open for ten years in hopes of getting a bank branch or chain restaurant, rather than rent each 25-foot section out to a separate tenant with higher turnover. Maybe they're right. Nobody gets rich running fleamarkets.