diff --git a/honeybee_schema/doe2/properties.py b/honeybee_schema/doe2/properties.py
index 6e21b90..e604431 100644
--- a/honeybee_schema/doe2/properties.py
+++ b/honeybee_schema/doe2/properties.py
@@ -4,6 +4,7 @@
 
 from .._base import NoExtraBaseModel
 from ..altnumber import Autocalculate
+from ..geometry import Face3D
 
 
 class RoomDoe2Properties(NoExtraBaseModel):
@@ -57,6 +58,16 @@ class RoomDoe2Properties(NoExtraBaseModel):
         'not be written into the INP.'
     )
 
+    space_polygon_geometry: Face3D = Field(
+        default=None,
+        description='An optional horizontal Face3D object, which will '
+        'be used to set the SPACE polygon during export to INP. If None, '
+        'the SPACE polygon is auto-calculated from the 3D Room geometry. '
+        'Specifying a geometry here can help overcome some limitations of '
+        'this auto-calculation, particularly for cases where the floors '
+        'of the Room are composed of AirBoundaries.'
+    )
+
 
 class ModelDoe2Properties(NoExtraBaseModel):