diff --git a/src/c3nav/mapdata/models/geometry/level.py b/src/c3nav/mapdata/models/geometry/level.py
index 0a0411e4..b9a21839 100644
--- a/src/c3nav/mapdata/models/geometry/level.py
+++ b/src/c3nav/mapdata/models/geometry/level.py
@@ -67,6 +67,7 @@ class Space(SpecificLocation, LevelGeometryMixin, models.Model):
 
     def _serialize(self, geometry=True, **kwargs):
         result = super()._serialize(geometry=geometry, **kwargs)
+        result['outside'] = self.outside
         result['height'] = None if self.height is None else float(str(self.height))
         return result
 
diff --git a/src/c3nav/mapdata/models/level.py b/src/c3nav/mapdata/models/level.py
index 5d12f194..4aa544b2 100644
--- a/src/c3nav/mapdata/models/level.py
+++ b/src/c3nav/mapdata/models/level.py
@@ -71,6 +71,7 @@ class Level(SpecificLocation, models.Model):
 
     def _serialize(self, level=True, **kwargs):
         result = super()._serialize(**kwargs)
+        result['on_top_of'] = self.on_top_of_id
         result['base_altitude'] = float(str(self.base_altitude))
         result['default_height'] = float(str(self.default_heights))
         return result