[
    {
        "type" : "overmap_special",
        "id" : "house_base",
        "locations" : [ "land", "swamp" ],
        "occurrences" : [0, 0],
        "overmaps" : [
            { "point":[0, 0, 0], "overmap": "house_base_north" },
            { "point":[0, 0, -1], "overmap": "basement" }
        ]
    },{
        "type" : "overmap_special",
        "id" : "house_two_story_basement",
        "locations" : [ "land", "swamp" ],
        "occurrences" : [0, 0],
        "overmaps" :
        [
            { "point":[0,0,0], "overmap": "house_2story_base_north" },
            { "point":[0,0,1], "overmap": "house_2story_second_north" },
            { "point":[0,0,-1], "overmap": "basement" }
        ]
    }
]