Preposterous Propositions V: Make it Ownable

Outdoor common space, like the neighborhoods streets, is a luxury. But, all too often it's left marred with litter or graffiti or the like. So, today's preposterous proposition: develop a model that gives surrounding community a monetary stake in their neighborhood - some way that the value of the 'common space' can be directed tied to the value of the home. Of course this already happens in condo/gated communities, but what about urban areas?