diff --git a/src/modules/stream/road_lines_data.cpp b/src/modules/stream/road_lines_data.cpp
index 39b9ab8..c6dc4c5 100644
--- a/src/modules/stream/road_lines_data.cpp
+++ b/src/modules/stream/road_lines_data.cpp
@@ -503,7 +503,8 @@ void RoadLinesData::update_line_segments(const String &line)
 }
 
 void RoadLinesData::line_add_building(const String &line, const String &key,
-				      float curve_offset, float normal_offset)
+				      float curve_offset, float normal_offset,
+				      float y_rotation)
 {
 	int index = BuildingsData::get_singleton()->get_building_by_key(key);
 	if (index < 0)
@@ -513,6 +514,7 @@ void RoadLinesData::line_add_building(const String &line, const String &key,
 	lb.building_key_hash = key.hash64();
 	lb.line_offset = curve_offset;
 	lb.normal_offset = normal_offset;
+	lb.y_rotation = y_rotation;
 	lines[line].buildings.push_back(lb);
 	// TODO: save/load
 	BuildingsData::get_singleton()->buildings[index].line_name = line;
@@ -606,8 +608,14 @@ void RoadLinesData::assign_close_buildings(const String &line)
 			print_line("adding: key: " + building_key +
 				   " dst: " + String::num(dst));
 			assert(result_offset >= 0);
+			Vector3 reference(0, 0, -1);
+			Vector3 rotated =
+				data.xform.basis.xform(reference).normalized();
+			float angle = reference.signed_angle_to(
+				rotated, Vector3(0, 1, 0));
+
 			line_add_building(line, building_key, result_offset,
-					  side);
+					  side, angle);
 		}
 	}
 }
diff --git a/src/modules/stream/road_lines_data.h b/src/modules/stream/road_lines_data.h
index fff6fac..7a38a07 100644
--- a/src/modules/stream/road_lines_data.h
+++ b/src/modules/stream/road_lines_data.h
@@ -19,6 +19,7 @@ public:
 		uint64_t building_key_hash;
 		float line_offset;
 		float normal_offset;
+		float y_rotation;
 	};
 	struct line_segment {
 		Vector3 p1;
@@ -55,7 +56,8 @@ public:
 	int get_debug_flags() const;
 	void update_line_segments(const String &line);
 	void line_add_building(const String &line, const String &key,
-			       float curve_offset, float normal_offset);
+			       float curve_offset, float normal_offset,
+			       float y_rotation);
 	void assign_close_buildings(const String &line);
 	bool line_has_building(const String &line, const String &building_key);
 	Vector3 get_point_by_offsets(const String &line, float dir_offset,