Well this is an interesting concept. One part allotment garden and one part summer home. Copenhagen's kolonihave is a community of small homes and gardens within biking distance of Copenhagen's city center. A place to get away and maybe plant some fresh mint for mojitos. It shares some similarities with the Toronto Islands (land trust) in that the owners own their home, but lease the land. Except in the case of Toronto you're not allowed to use your island residence as a summer home. If you want to live on the islands, you need to tough out the winters and make it your principal residence. Regardless of the ownership structure, there is something clearly endearing about these small homes and gardens. And I bet that there would be a lot of demand for something like this if it could be done at any sort of scale.