Nokisaki.com, named after the Japanese word for the space that juts out from the edge of a building, seeks pockets of "dead space" around cities and converts them into short-term rental property.
In Tokyo, where every sliver of land is at a premium, a few feet of unused private property near the front entrance of an apartment building can be used to sell muffins. A patch of storefront space transforms into an ad hoc vegetable stand for a farmer or a consulting space for a fortune-teller.
Those spaces can be reserved at Nokisaki for short periods of time—starting from three hours—and for as little as $15 total. The spots are granted on a first-come, first-served basis and the rental times and prices are set by landlords.
(Link via Amateur Economist.)