diff --git a/src/db/db/dbAsIfFlatRegion.cc b/src/db/db/dbAsIfFlatRegion.cc
index b6b3a80b7..aa66e3d1e 100644
--- a/src/db/db/dbAsIfFlatRegion.cc
+++ b/src/db/db/dbAsIfFlatRegion.cc
@@ -1428,12 +1428,12 @@ AsIfFlatRegion::not_with (const Region &other, PropertyConstraint property_const
   } else if (other.empty () && ! strict_handling ()) {
 
     //  Nothing to do
-    return clone ();
+    return clone ()->remove_properties (pc_remove (property_constraint));
 
   } else if (! bbox ().overlaps (other.bbox ()) && ! strict_handling ()) {
 
     //  Nothing to do
-    return clone ();
+    return clone ()->remove_properties (pc_remove (property_constraint));
 
   } else {
     return and_or_not_with (false, other, property_constraint);
@@ -1513,12 +1513,12 @@ AsIfFlatRegion::andnot_with (const Region &other, PropertyConstraint property_co
   } else if (other.empty () && ! strict_handling ()) {
 
     //  Nothing to do
-    return std::make_pair (new EmptyRegion (), clone ());
+    return std::make_pair (new EmptyRegion (), clone ()->remove_properties (pc_remove (property_constraint)));
 
   } else if (! bbox ().overlaps (other.bbox ()) && ! strict_handling ()) {
 
     //  Nothing to do
-    return std::make_pair (new EmptyRegion (), clone ());
+    return std::make_pair (new EmptyRegion (), clone ()->remove_properties (pc_remove (property_constraint)));
 
   } else if (pc_skip (property_constraint)) {
 
diff --git a/src/db/db/dbDeepRegion.cc b/src/db/db/dbDeepRegion.cc
index c0630158d..0d7d725de 100644
--- a/src/db/db/dbDeepRegion.cc
+++ b/src/db/db/dbDeepRegion.cc
@@ -783,11 +783,11 @@ DeepRegion::and_with (const Region &other, PropertyConstraint property_constrain
 
   if (empty ()) {
 
-    return clone ();
+    return clone ()->remove_properties (pc_remove (property_constraint));
 
   } else if (other.empty ()) {
 
-    return other.delegate ()->clone ();
+    return other.delegate ()->clone ()->remove_properties (pc_remove (property_constraint));
 
   } else if (! other_deep) {
 
@@ -807,7 +807,7 @@ DeepRegion::not_with (const Region &other, PropertyConstraint property_constrain
 
   if (empty () || other.empty ()) {
 
-    return clone ();
+    return clone ()->remove_properties (pc_remove (property_constraint));
 
   } else if (! other_deep) {
 
@@ -835,11 +835,11 @@ DeepRegion::andnot_with (const Region &other, PropertyConstraint property_constr
 
   if (empty ()) {
 
-    return std::make_pair (clone (), clone ());
+    return std::make_pair (clone ()->remove_properties (pc_remove (property_constraint)), clone ()->remove_properties (pc_remove (property_constraint)));
 
   } else if (other.empty ()) {
 
-    return std::make_pair (other.delegate ()->clone (), clone ());
+    return std::make_pair (other.delegate ()->clone ()->remove_properties (pc_remove (property_constraint)), clone ()->remove_properties (pc_remove (property_constraint)));
 
   } else if (! other_deep) {
 
diff --git a/src/db/db/dbEdgePairsDelegate.h b/src/db/db/dbEdgePairsDelegate.h
index 4ea093ede..6cdf92e5c 100644
--- a/src/db/db/dbEdgePairsDelegate.h
+++ b/src/db/db/dbEdgePairsDelegate.h
@@ -166,6 +166,12 @@ public:
 
   virtual EdgePairsDelegate *clone () const = 0;
 
+  EdgePairsDelegate *remove_properties (bool remove = true)
+  {
+    ShapeCollectionDelegateBase::remove_properties (remove);
+    return this;
+  }
+
   void enable_progress (const std::string &progress_desc);
   void disable_progress ();
 
diff --git a/src/db/db/dbEdgesDelegate.h b/src/db/db/dbEdgesDelegate.h
index cba4e40f9..182700bae 100644
--- a/src/db/db/dbEdgesDelegate.h
+++ b/src/db/db/dbEdgesDelegate.h
@@ -239,6 +239,12 @@ public:
 
   virtual EdgesDelegate *clone () const = 0;
 
+  EdgesDelegate *remove_properties (bool remove = true)
+  {
+    ShapeCollectionDelegateBase::remove_properties (remove);
+    return this;
+  }
+
   void set_base_verbosity (int vb);
   int base_verbosity () const
   {
diff --git a/src/db/db/dbFlatEdgePairs.cc b/src/db/db/dbFlatEdgePairs.cc
index 5204387db..eff3816fe 100644
--- a/src/db/db/dbFlatEdgePairs.cc
+++ b/src/db/db/dbFlatEdgePairs.cc
@@ -192,11 +192,15 @@ const db::RecursiveShapeIterator *FlatEdgePairs::iter () const
 
 void FlatEdgePairs::apply_property_translator (const db::PropertiesTranslator &pt)
 {
-  db::Shapes new_edge_pairs (mp_edge_pairs->is_editable ());
-  new_edge_pairs.assign (*mp_edge_pairs, pt);
-  mp_edge_pairs->swap (new_edge_pairs);
+  if ((mp_edge_pairs->type_mask () & db::ShapeIterator::Properties) != 0) {
 
-  invalidate_cache ();
+    db::Shapes new_edge_pairs (mp_edge_pairs->is_editable ());
+    new_edge_pairs.assign (*mp_edge_pairs, pt);
+    mp_edge_pairs->swap (new_edge_pairs);
+
+    invalidate_cache ();
+
+  }
 }
 
 db::PropertiesRepository *FlatEdgePairs::properties_repository ()
diff --git a/src/db/db/dbFlatEdges.cc b/src/db/db/dbFlatEdges.cc
index e185fc5e6..5e386c431 100644
--- a/src/db/db/dbFlatEdges.cc
+++ b/src/db/db/dbFlatEdges.cc
@@ -390,11 +390,15 @@ const db::RecursiveShapeIterator *FlatEdges::iter () const
 
 void FlatEdges::apply_property_translator (const db::PropertiesTranslator &pt)
 {
-  db::Shapes new_edges (mp_edges->is_editable ());
-  new_edges.assign (*mp_edges, pt);
-  mp_edges->swap (new_edges);
+  if ((mp_edges->type_mask () & db::ShapeIterator::Properties) != 0) {
 
-  invalidate_cache ();
+    db::Shapes new_edges (mp_edges->is_editable ());
+    new_edges.assign (*mp_edges, pt);
+    mp_edges->swap (new_edges);
+
+    invalidate_cache ();
+
+  }
 }
 
 db::PropertiesRepository *FlatEdges::properties_repository ()
diff --git a/src/db/db/dbFlatRegion.cc b/src/db/db/dbFlatRegion.cc
index 248b9121a..307984b9d 100644
--- a/src/db/db/dbFlatRegion.cc
+++ b/src/db/db/dbFlatRegion.cc
@@ -421,11 +421,15 @@ const db::RecursiveShapeIterator *FlatRegion::iter () const
 
 void FlatRegion::apply_property_translator (const db::PropertiesTranslator &pt)
 {
-  db::Shapes new_polygons (mp_polygons->is_editable ());
-  new_polygons.assign (*mp_polygons, pt);
-  mp_polygons->swap (new_polygons);
+  if ((mp_polygons->type_mask () & db::ShapeIterator::Properties) != 0) {
 
-  invalidate_cache ();
+    db::Shapes new_polygons (mp_polygons->is_editable ());
+    new_polygons.assign (*mp_polygons, pt);
+    mp_polygons->swap (new_polygons);
+
+    invalidate_cache ();
+
+  }
 }
 
 db::PropertiesRepository *FlatRegion::properties_repository ()
diff --git a/src/db/db/dbFlatTexts.cc b/src/db/db/dbFlatTexts.cc
index 3b00b400a..26a718116 100644
--- a/src/db/db/dbFlatTexts.cc
+++ b/src/db/db/dbFlatTexts.cc
@@ -190,11 +190,15 @@ const db::RecursiveShapeIterator *FlatTexts::iter () const
 
 void FlatTexts::apply_property_translator (const db::PropertiesTranslator &pt)
 {
-  db::Shapes new_texts (mp_texts->is_editable ());
-  new_texts.assign (*mp_texts, pt);
-  mp_texts->swap (new_texts);
+  if ((mp_texts->type_mask () & db::ShapeIterator::Properties) != 0) {
 
-  invalidate_cache ();
+    db::Shapes new_texts (mp_texts->is_editable ());
+    new_texts.assign (*mp_texts, pt);
+    mp_texts->swap (new_texts);
+
+    invalidate_cache ();
+
+  }
 }
 
 db::PropertiesRepository *FlatTexts::properties_repository ()
diff --git a/src/db/db/dbRegionDelegate.h b/src/db/db/dbRegionDelegate.h
index d4ccac4a2..1b701f26d 100644
--- a/src/db/db/dbRegionDelegate.h
+++ b/src/db/db/dbRegionDelegate.h
@@ -196,6 +196,12 @@ public:
 
   virtual RegionDelegate *clone () const = 0;
 
+  RegionDelegate *remove_properties (bool remove = true)
+  {
+    ShapeCollectionDelegateBase::remove_properties (remove);
+    return this;
+  }
+
   void set_base_verbosity (int vb);
   int base_verbosity () const
   {
diff --git a/src/db/db/dbShapeCollection.cc b/src/db/db/dbShapeCollection.cc
index 4d5a3a0fc..ba1eb224b 100644
--- a/src/db/db/dbShapeCollection.cc
+++ b/src/db/db/dbShapeCollection.cc
@@ -55,11 +55,16 @@ DeepShapeCollectionDelegateBase::apply_property_translator (const db::Properties
   for (auto c = layout.begin (); c != layout.end (); ++c) {
 
     db::Shapes &shapes = c->shapes (m_deep_layer.layer ());
+    if ((shapes.type_mask () & ShapeIterator::Properties) != 0) {
 
-    db::Shapes new_shapes (shapes.is_editable ());
-    shapes.swap (new_shapes);
+      //  properties are present - need to translate them
 
-    shapes.assign (new_shapes, pt);
+      db::Shapes new_shapes (shapes.is_editable ());
+      shapes.swap (new_shapes);
+
+      shapes.assign (new_shapes, pt);
+
+    }
 
   }
 }
diff --git a/src/db/db/dbShapeCollection.h b/src/db/db/dbShapeCollection.h
index 4e4824811..a036e0887 100644
--- a/src/db/db/dbShapeCollection.h
+++ b/src/db/db/dbShapeCollection.h
@@ -83,6 +83,13 @@ public:
   virtual void apply_property_translator (const db::PropertiesTranslator & /*pt*/) = 0;
   virtual db::PropertiesRepository *properties_repository () = 0;
   virtual const db::PropertiesRepository *properties_repository () const = 0;
+
+  void remove_properties (bool remove = true)
+  {
+    if (remove) {
+      apply_property_translator (db::PropertiesTranslator::make_remove_all ());
+    }
+  }
 };
 
 /**
diff --git a/src/db/db/dbTextsDelegate.h b/src/db/db/dbTextsDelegate.h
index 367ced7f1..726714dad 100644
--- a/src/db/db/dbTextsDelegate.h
+++ b/src/db/db/dbTextsDelegate.h
@@ -66,6 +66,12 @@ public:
 
   virtual TextsDelegate *clone () const = 0;
 
+  TextsDelegate *remove_properties (bool remove = true)
+  {
+    ShapeCollectionDelegateBase::remove_properties (remove);
+    return this;
+  }
+
   void enable_progress (const std::string &progress_desc);
   void disable_progress ();
 
diff --git a/src/db/unit_tests/dbAsIfFlatRegionTests.cc b/src/db/unit_tests/dbAsIfFlatRegionTests.cc
index 91333e70f..124ac5f15 100644
--- a/src/db/unit_tests/dbAsIfFlatRegionTests.cc
+++ b/src/db/unit_tests/dbAsIfFlatRegionTests.cc
@@ -1688,6 +1688,12 @@ TEST(40_BoolWithProperties)
   target.insert (target_top_cell_index, target.get_layer (db::LayerProperties (25, 0)), r3.bool_and (r2, db::DifferentPropertiesConstraint));
   target.insert (target_top_cell_index, target.get_layer (db::LayerProperties (26, 0)), r1.bool_and (r3, db::SamePropertiesConstraint));
   target.insert (target_top_cell_index, target.get_layer (db::LayerProperties (27, 0)), r1.bool_and (r3, db::DifferentPropertiesConstraint));
+  target.insert (target_top_cell_index, target.get_layer (db::LayerProperties (22, 1)), r1.bool_and (r2, db::SamePropertiesConstraintDrop));
+  target.insert (target_top_cell_index, target.get_layer (db::LayerProperties (23, 1)), r1.bool_and (r2, db::DifferentPropertiesConstraintDrop));
+  target.insert (target_top_cell_index, target.get_layer (db::LayerProperties (24, 1)), r3.bool_and (r2, db::SamePropertiesConstraintDrop));
+  target.insert (target_top_cell_index, target.get_layer (db::LayerProperties (25, 1)), r3.bool_and (r2, db::DifferentPropertiesConstraintDrop));
+  target.insert (target_top_cell_index, target.get_layer (db::LayerProperties (26, 1)), r1.bool_and (r3, db::SamePropertiesConstraintDrop));
+  target.insert (target_top_cell_index, target.get_layer (db::LayerProperties (27, 1)), r1.bool_and (r3, db::DifferentPropertiesConstraintDrop));
 
   target.insert (target_top_cell_index, target.get_layer (db::LayerProperties (30, 0)), r1 - r2);
   target.insert (target_top_cell_index, target.get_layer (db::LayerProperties (31, 0)), r1.bool_not (r2, db::NoPropertyConstraint));
@@ -1697,6 +1703,12 @@ TEST(40_BoolWithProperties)
   target.insert (target_top_cell_index, target.get_layer (db::LayerProperties (35, 0)), r3.bool_not (r2, db::DifferentPropertiesConstraint));
   target.insert (target_top_cell_index, target.get_layer (db::LayerProperties (36, 0)), r1.bool_not (r3, db::SamePropertiesConstraint));
   target.insert (target_top_cell_index, target.get_layer (db::LayerProperties (37, 0)), r1.bool_not (r3, db::DifferentPropertiesConstraint));
+  target.insert (target_top_cell_index, target.get_layer (db::LayerProperties (32, 1)), r1.bool_not (r2, db::SamePropertiesConstraintDrop));
+  target.insert (target_top_cell_index, target.get_layer (db::LayerProperties (33, 1)), r1.bool_not (r2, db::DifferentPropertiesConstraintDrop));
+  target.insert (target_top_cell_index, target.get_layer (db::LayerProperties (34, 1)), r3.bool_not (r2, db::SamePropertiesConstraintDrop));
+  target.insert (target_top_cell_index, target.get_layer (db::LayerProperties (35, 1)), r3.bool_not (r2, db::DifferentPropertiesConstraintDrop));
+  target.insert (target_top_cell_index, target.get_layer (db::LayerProperties (36, 1)), r1.bool_not (r3, db::SamePropertiesConstraintDrop));
+  target.insert (target_top_cell_index, target.get_layer (db::LayerProperties (37, 1)), r1.bool_not (r3, db::DifferentPropertiesConstraintDrop));
 
   target.insert (target_top_cell_index, target.get_layer (db::LayerProperties (40, 0)), r1.andnot (r2).first);
   target.insert (target_top_cell_index, target.get_layer (db::LayerProperties (41, 0)), r1.andnot (r2).second);
@@ -1712,6 +1724,18 @@ TEST(40_BoolWithProperties)
   target.insert (target_top_cell_index, target.get_layer (db::LayerProperties (51, 0)), r1.andnot (r3, db::SamePropertiesConstraint).second);
   target.insert (target_top_cell_index, target.get_layer (db::LayerProperties (52, 0)), r1.andnot (r3, db::DifferentPropertiesConstraint).first);
   target.insert (target_top_cell_index, target.get_layer (db::LayerProperties (53, 0)), r1.andnot (r3, db::DifferentPropertiesConstraint).second);
+  target.insert (target_top_cell_index, target.get_layer (db::LayerProperties (42, 1)), r1.andnot (r2, db::SamePropertiesConstraintDrop).first);
+  target.insert (target_top_cell_index, target.get_layer (db::LayerProperties (43, 1)), r1.andnot (r2, db::SamePropertiesConstraintDrop).second);
+  target.insert (target_top_cell_index, target.get_layer (db::LayerProperties (44, 1)), r1.andnot (r2, db::DifferentPropertiesConstraintDrop).first);
+  target.insert (target_top_cell_index, target.get_layer (db::LayerProperties (45, 1)), r1.andnot (r2, db::DifferentPropertiesConstraintDrop).second);
+  target.insert (target_top_cell_index, target.get_layer (db::LayerProperties (46, 1)), r3.andnot (r2, db::SamePropertiesConstraintDrop).first);
+  target.insert (target_top_cell_index, target.get_layer (db::LayerProperties (47, 1)), r3.andnot (r2, db::SamePropertiesConstraintDrop).second);
+  target.insert (target_top_cell_index, target.get_layer (db::LayerProperties (48, 1)), r3.andnot (r2, db::DifferentPropertiesConstraintDrop).first);
+  target.insert (target_top_cell_index, target.get_layer (db::LayerProperties (49, 1)), r3.andnot (r2, db::DifferentPropertiesConstraintDrop).second);
+  target.insert (target_top_cell_index, target.get_layer (db::LayerProperties (50, 1)), r1.andnot (r3, db::SamePropertiesConstraintDrop).first);
+  target.insert (target_top_cell_index, target.get_layer (db::LayerProperties (51, 1)), r1.andnot (r3, db::SamePropertiesConstraintDrop).second);
+  target.insert (target_top_cell_index, target.get_layer (db::LayerProperties (52, 1)), r1.andnot (r3, db::DifferentPropertiesConstraintDrop).first);
+  target.insert (target_top_cell_index, target.get_layer (db::LayerProperties (53, 1)), r1.andnot (r3, db::DifferentPropertiesConstraintDrop).second);
 
   CHECKPOINT();
   db::compare_layouts (_this, target, tl::testdata () + "/algo/flat_region_au40.gds");
@@ -1829,12 +1853,24 @@ TEST(42_DRCWithProperties)
   target.insert (target_top_cell_index, target.get_layer (db::LayerProperties (31, 0)), r1.separation_check (r2, 1000, opt));
   target.insert (target_top_cell_index, target.get_layer (db::LayerProperties (32, 0)), r2.space_check (1000, opt));
 
+  opt.prop_constraint = db::SamePropertiesConstraintDrop;
+
+  target.insert (target_top_cell_index, target.get_layer (db::LayerProperties (30, 1)), r1.space_check (1000, opt));
+  target.insert (target_top_cell_index, target.get_layer (db::LayerProperties (31, 1)), r1.separation_check (r2, 1000, opt));
+  target.insert (target_top_cell_index, target.get_layer (db::LayerProperties (32, 1)), r2.space_check (1000, opt));
+
   opt.prop_constraint = db::DifferentPropertiesConstraint;
 
   target.insert (target_top_cell_index, target.get_layer (db::LayerProperties (40, 0)), r1.space_check (1000, opt));
   target.insert (target_top_cell_index, target.get_layer (db::LayerProperties (41, 0)), r1.separation_check (r2, 1000, opt));
   target.insert (target_top_cell_index, target.get_layer (db::LayerProperties (42, 0)), r2.space_check (1000, opt));
 
+  opt.prop_constraint = db::DifferentPropertiesConstraintDrop;
+
+  target.insert (target_top_cell_index, target.get_layer (db::LayerProperties (40, 1)), r1.space_check (1000, opt));
+  target.insert (target_top_cell_index, target.get_layer (db::LayerProperties (41, 1)), r1.separation_check (r2, 1000, opt));
+  target.insert (target_top_cell_index, target.get_layer (db::LayerProperties (42, 1)), r2.space_check (1000, opt));
+
   CHECKPOINT();
   db::compare_layouts (_this, target, tl::testdata () + "/algo/flat_region_au42.gds");
 }
@@ -1896,10 +1932,18 @@ TEST(43_ComplexOpsWithProperties)
   target.insert (target_top_cell_index, target.get_layer (db::LayerProperties (31, 0)), r1.cop_to_region (sep_check2p, db::SamePropertiesConstraint));
   target.insert (target_top_cell_index, target.get_layer (db::LayerProperties (32, 0)), r1.cop_to_edges (sep_check2e, db::SamePropertiesConstraint));
 
+  target.insert (target_top_cell_index, target.get_layer (db::LayerProperties (30, 1)), r1.cop_to_edge_pairs (sep_check, db::SamePropertiesConstraintDrop));
+  target.insert (target_top_cell_index, target.get_layer (db::LayerProperties (31, 1)), r1.cop_to_region (sep_check2p, db::SamePropertiesConstraintDrop));
+  target.insert (target_top_cell_index, target.get_layer (db::LayerProperties (32, 1)), r1.cop_to_edges (sep_check2e, db::SamePropertiesConstraintDrop));
+
   target.insert (target_top_cell_index, target.get_layer (db::LayerProperties (40, 0)), r1.cop_to_edge_pairs (sep_check, db::DifferentPropertiesConstraint));
   target.insert (target_top_cell_index, target.get_layer (db::LayerProperties (41, 0)), r1.cop_to_region (sep_check2p, db::DifferentPropertiesConstraint));
   target.insert (target_top_cell_index, target.get_layer (db::LayerProperties (42, 0)), r1.cop_to_edges (sep_check2e, db::DifferentPropertiesConstraint));
 
+  target.insert (target_top_cell_index, target.get_layer (db::LayerProperties (40, 1)), r1.cop_to_edge_pairs (sep_check, db::DifferentPropertiesConstraintDrop));
+  target.insert (target_top_cell_index, target.get_layer (db::LayerProperties (41, 1)), r1.cop_to_region (sep_check2p, db::DifferentPropertiesConstraintDrop));
+  target.insert (target_top_cell_index, target.get_layer (db::LayerProperties (42, 1)), r1.cop_to_edges (sep_check2e, db::DifferentPropertiesConstraintDrop));
+
   CHECKPOINT();
   db::compare_layouts (_this, target, tl::testdata () + "/algo/flat_region_au43.gds");
 }
@@ -1932,9 +1976,6 @@ TEST(44_SizeWithProperties)
   db::Layout target;
   unsigned int target_top_cell_index = target.add_cell (ly.cell_name (top_cell_index));
 
-  db::RegionCheckOptions opt;
-  opt.metrics = db::Projection;
-
   target.insert (target_top_cell_index, target.get_layer (db::LayerProperties (1, 0)), r1);
   target.insert (target_top_cell_index, target.get_layer (db::LayerProperties (2, 0)), r2);
 
diff --git a/src/db/unit_tests/dbDeepRegionTests.cc b/src/db/unit_tests/dbDeepRegionTests.cc
index 6cf0658d5..89117d591 100644
--- a/src/db/unit_tests/dbDeepRegionTests.cc
+++ b/src/db/unit_tests/dbDeepRegionTests.cc
@@ -2176,6 +2176,12 @@ TEST(40_BoolWithProperties)
   target.insert (target_top_cell_index, target.get_layer (db::LayerProperties (25, 0)), r3.bool_and (r2, db::DifferentPropertiesConstraint));
   target.insert (target_top_cell_index, target.get_layer (db::LayerProperties (26, 0)), r1.bool_and (r3, db::SamePropertiesConstraint));
   target.insert (target_top_cell_index, target.get_layer (db::LayerProperties (27, 0)), r1.bool_and (r3, db::DifferentPropertiesConstraint));
+  target.insert (target_top_cell_index, target.get_layer (db::LayerProperties (22, 1)), r1.bool_and (r2, db::SamePropertiesConstraintDrop));
+  target.insert (target_top_cell_index, target.get_layer (db::LayerProperties (23, 1)), r1.bool_and (r2, db::DifferentPropertiesConstraintDrop));
+  target.insert (target_top_cell_index, target.get_layer (db::LayerProperties (24, 1)), r3.bool_and (r2, db::SamePropertiesConstraintDrop));
+  target.insert (target_top_cell_index, target.get_layer (db::LayerProperties (25, 1)), r3.bool_and (r2, db::DifferentPropertiesConstraintDrop));
+  target.insert (target_top_cell_index, target.get_layer (db::LayerProperties (26, 1)), r1.bool_and (r3, db::SamePropertiesConstraintDrop));
+  target.insert (target_top_cell_index, target.get_layer (db::LayerProperties (27, 1)), r1.bool_and (r3, db::DifferentPropertiesConstraintDrop));
 
   target.insert (target_top_cell_index, target.get_layer (db::LayerProperties (30, 0)), r1 - r2);
   target.insert (target_top_cell_index, target.get_layer (db::LayerProperties (31, 0)), r1.bool_not (r2, db::NoPropertyConstraint));
@@ -2185,6 +2191,12 @@ TEST(40_BoolWithProperties)
   target.insert (target_top_cell_index, target.get_layer (db::LayerProperties (35, 0)), r3.bool_not (r2, db::DifferentPropertiesConstraint));
   target.insert (target_top_cell_index, target.get_layer (db::LayerProperties (36, 0)), r1.bool_not (r3, db::SamePropertiesConstraint));
   target.insert (target_top_cell_index, target.get_layer (db::LayerProperties (37, 0)), r1.bool_not (r3, db::DifferentPropertiesConstraint));
+  target.insert (target_top_cell_index, target.get_layer (db::LayerProperties (32, 1)), r1.bool_not (r2, db::SamePropertiesConstraintDrop));
+  target.insert (target_top_cell_index, target.get_layer (db::LayerProperties (33, 1)), r1.bool_not (r2, db::DifferentPropertiesConstraintDrop));
+  target.insert (target_top_cell_index, target.get_layer (db::LayerProperties (34, 1)), r3.bool_not (r2, db::SamePropertiesConstraintDrop));
+  target.insert (target_top_cell_index, target.get_layer (db::LayerProperties (35, 1)), r3.bool_not (r2, db::DifferentPropertiesConstraintDrop));
+  target.insert (target_top_cell_index, target.get_layer (db::LayerProperties (36, 1)), r1.bool_not (r3, db::SamePropertiesConstraintDrop));
+  target.insert (target_top_cell_index, target.get_layer (db::LayerProperties (37, 1)), r1.bool_not (r3, db::DifferentPropertiesConstraintDrop));
 
   target.insert (target_top_cell_index, target.get_layer (db::LayerProperties (40, 0)), r1.andnot (r2).first);
   target.insert (target_top_cell_index, target.get_layer (db::LayerProperties (41, 0)), r1.andnot (r2).second);
@@ -2200,6 +2212,18 @@ TEST(40_BoolWithProperties)
   target.insert (target_top_cell_index, target.get_layer (db::LayerProperties (51, 0)), r1.andnot (r3, db::SamePropertiesConstraint).second);
   target.insert (target_top_cell_index, target.get_layer (db::LayerProperties (52, 0)), r1.andnot (r3, db::DifferentPropertiesConstraint).first);
   target.insert (target_top_cell_index, target.get_layer (db::LayerProperties (53, 0)), r1.andnot (r3, db::DifferentPropertiesConstraint).second);
+  target.insert (target_top_cell_index, target.get_layer (db::LayerProperties (42, 1)), r1.andnot (r2, db::SamePropertiesConstraintDrop).first);
+  target.insert (target_top_cell_index, target.get_layer (db::LayerProperties (43, 1)), r1.andnot (r2, db::SamePropertiesConstraintDrop).second);
+  target.insert (target_top_cell_index, target.get_layer (db::LayerProperties (44, 1)), r1.andnot (r2, db::DifferentPropertiesConstraintDrop).first);
+  target.insert (target_top_cell_index, target.get_layer (db::LayerProperties (45, 1)), r1.andnot (r2, db::DifferentPropertiesConstraintDrop).second);
+  target.insert (target_top_cell_index, target.get_layer (db::LayerProperties (46, 1)), r3.andnot (r2, db::SamePropertiesConstraintDrop).first);
+  target.insert (target_top_cell_index, target.get_layer (db::LayerProperties (47, 1)), r3.andnot (r2, db::SamePropertiesConstraintDrop).second);
+  target.insert (target_top_cell_index, target.get_layer (db::LayerProperties (48, 1)), r3.andnot (r2, db::DifferentPropertiesConstraintDrop).first);
+  target.insert (target_top_cell_index, target.get_layer (db::LayerProperties (49, 1)), r3.andnot (r2, db::DifferentPropertiesConstraintDrop).second);
+  target.insert (target_top_cell_index, target.get_layer (db::LayerProperties (50, 1)), r1.andnot (r3, db::SamePropertiesConstraintDrop).first);
+  target.insert (target_top_cell_index, target.get_layer (db::LayerProperties (51, 1)), r1.andnot (r3, db::SamePropertiesConstraintDrop).second);
+  target.insert (target_top_cell_index, target.get_layer (db::LayerProperties (52, 1)), r1.andnot (r3, db::DifferentPropertiesConstraintDrop).first);
+  target.insert (target_top_cell_index, target.get_layer (db::LayerProperties (53, 1)), r1.andnot (r3, db::DifferentPropertiesConstraintDrop).second);
 
   CHECKPOINT();
   db::compare_layouts (_this, target, tl::testdata () + "/algo/deep_region_au40.gds");
@@ -2321,12 +2345,24 @@ TEST(42_DRCWithProperties)
   target.insert (target_top_cell_index, target.get_layer (db::LayerProperties (31, 0)), r1.separation_check (r2, 1000, opt));
   target.insert (target_top_cell_index, target.get_layer (db::LayerProperties (32, 0)), r2.space_check (1000, opt));
 
+  opt.prop_constraint = db::SamePropertiesConstraintDrop;
+
+  target.insert (target_top_cell_index, target.get_layer (db::LayerProperties (30, 1)), r1.space_check (1000, opt));
+  target.insert (target_top_cell_index, target.get_layer (db::LayerProperties (31, 1)), r1.separation_check (r2, 1000, opt));
+  target.insert (target_top_cell_index, target.get_layer (db::LayerProperties (32, 1)), r2.space_check (1000, opt));
+
   opt.prop_constraint = db::DifferentPropertiesConstraint;
 
   target.insert (target_top_cell_index, target.get_layer (db::LayerProperties (40, 0)), r1.space_check (1000, opt));
   target.insert (target_top_cell_index, target.get_layer (db::LayerProperties (41, 0)), r1.separation_check (r2, 1000, opt));
   target.insert (target_top_cell_index, target.get_layer (db::LayerProperties (42, 0)), r2.space_check (1000, opt));
 
+  opt.prop_constraint = db::DifferentPropertiesConstraintDrop;
+
+  target.insert (target_top_cell_index, target.get_layer (db::LayerProperties (40, 1)), r1.space_check (1000, opt));
+  target.insert (target_top_cell_index, target.get_layer (db::LayerProperties (41, 1)), r1.separation_check (r2, 1000, opt));
+  target.insert (target_top_cell_index, target.get_layer (db::LayerProperties (42, 1)), r2.space_check (1000, opt));
+
   CHECKPOINT();
   db::compare_layouts (_this, target, tl::testdata () + "/algo/deep_region_au42.gds");
 }
@@ -2390,10 +2426,18 @@ TEST(43_ComplexOpsWithProperties)
   target.insert (target_top_cell_index, target.get_layer (db::LayerProperties (31, 0)), r1.cop_to_region (sep_check2p, db::SamePropertiesConstraint));
   target.insert (target_top_cell_index, target.get_layer (db::LayerProperties (32, 0)), r1.cop_to_edges (sep_check2e, db::SamePropertiesConstraint));
 
+  target.insert (target_top_cell_index, target.get_layer (db::LayerProperties (30, 1)), r1.cop_to_edge_pairs (sep_check, db::SamePropertiesConstraintDrop));
+  target.insert (target_top_cell_index, target.get_layer (db::LayerProperties (31, 1)), r1.cop_to_region (sep_check2p, db::SamePropertiesConstraintDrop));
+  target.insert (target_top_cell_index, target.get_layer (db::LayerProperties (32, 1)), r1.cop_to_edges (sep_check2e, db::SamePropertiesConstraintDrop));
+
   target.insert (target_top_cell_index, target.get_layer (db::LayerProperties (40, 0)), r1.cop_to_edge_pairs (sep_check, db::DifferentPropertiesConstraint));
   target.insert (target_top_cell_index, target.get_layer (db::LayerProperties (41, 0)), r1.cop_to_region (sep_check2p, db::DifferentPropertiesConstraint));
   target.insert (target_top_cell_index, target.get_layer (db::LayerProperties (42, 0)), r1.cop_to_edges (sep_check2e, db::DifferentPropertiesConstraint));
 
+  target.insert (target_top_cell_index, target.get_layer (db::LayerProperties (40, 1)), r1.cop_to_edge_pairs (sep_check, db::DifferentPropertiesConstraintDrop));
+  target.insert (target_top_cell_index, target.get_layer (db::LayerProperties (41, 1)), r1.cop_to_region (sep_check2p, db::DifferentPropertiesConstraintDrop));
+  target.insert (target_top_cell_index, target.get_layer (db::LayerProperties (42, 1)), r1.cop_to_edges (sep_check2e, db::DifferentPropertiesConstraintDrop));
+
   CHECKPOINT();
   db::compare_layouts (_this, target, tl::testdata () + "/algo/deep_region_au43.gds");
 }
@@ -2428,9 +2472,6 @@ TEST(44_SizeWithProperties)
   db::Layout target;
   unsigned int target_top_cell_index = target.add_cell (ly.cell_name (top_cell_index));
 
-  db::RegionCheckOptions opt;
-  opt.metrics = db::Projection;
-
   target.insert (target_top_cell_index, target.get_layer (db::LayerProperties (1, 0)), r1);
   target.insert (target_top_cell_index, target.get_layer (db::LayerProperties (2, 0)), r2);
 
diff --git a/src/drc/drc/built-in-macros/_drc_engine.rb b/src/drc/drc/built-in-macros/_drc_engine.rb
index a5bd6286d..b3c1c82f4 100644
--- a/src/drc/drc/built-in-macros/_drc_engine.rb
+++ b/src/drc/drc/built-in-macros/_drc_engine.rb
@@ -318,13 +318,13 @@ module DRC
      
     def props_eq
       self._context("props_eq") do
-        DRCPropertiesConstraint::new(RBA::Region::SamePropertiesConstraint)
+        DRCPropertiesConstraint::new(RBA::Region::SamePropertiesConstraintDrop)
       end
     end
     
     def props_ne
       self._context("props_ne") do
-        DRCPropertiesConstraint::new(RBA::Region::DifferentPropertiesConstraint)
+        DRCPropertiesConstraint::new(RBA::Region::DifferentPropertiesConstraintDrop)
       end
     end
     
diff --git a/testdata/algo/deep_region_au40.gds b/testdata/algo/deep_region_au40.gds
index c6764b0b6..84d6d4969 100644
Binary files a/testdata/algo/deep_region_au40.gds and b/testdata/algo/deep_region_au40.gds differ
diff --git a/testdata/algo/deep_region_au42.gds b/testdata/algo/deep_region_au42.gds
index 6fa76a15f..7a633c745 100644
Binary files a/testdata/algo/deep_region_au42.gds and b/testdata/algo/deep_region_au42.gds differ
diff --git a/testdata/algo/deep_region_au43.gds b/testdata/algo/deep_region_au43.gds
index c65a1ecc3..857661a5b 100644
Binary files a/testdata/algo/deep_region_au43.gds and b/testdata/algo/deep_region_au43.gds differ
diff --git a/testdata/algo/flat_region_au40.gds b/testdata/algo/flat_region_au40.gds
index bb410687a..682ed0746 100644
Binary files a/testdata/algo/flat_region_au40.gds and b/testdata/algo/flat_region_au40.gds differ
diff --git a/testdata/algo/flat_region_au42.gds b/testdata/algo/flat_region_au42.gds
index 3f846fdd6..7963f8104 100644
Binary files a/testdata/algo/flat_region_au42.gds and b/testdata/algo/flat_region_au42.gds differ
diff --git a/testdata/algo/flat_region_au43.gds b/testdata/algo/flat_region_au43.gds
index 33db39033..5295c4d6a 100644
Binary files a/testdata/algo/flat_region_au43.gds and b/testdata/algo/flat_region_au43.gds differ
diff --git a/testdata/drc/drcSimpleTests_70.drc b/testdata/drc/drcSimpleTests_70.drc
index 860fe612c..c39b4556f 100644
--- a/testdata/drc/drcSimpleTests_70.drc
+++ b/testdata/drc/drcSimpleTests_70.drc
@@ -84,6 +84,8 @@ l1_nets.space(1.0.um, projection, props_ne + props_copy).polygons.output(202, 0)
 l1_nets.space(1.0.um, projection, props_copy).polygons.output(203, 0)
 l1_nets.width(1.0.um, projection).polygons.output(204, 0)
 l1_nets.width(1.0.um, projection, props_copy).polygons.output(205, 0)
+l1_nets.space(1.0.um, projection, props_eq).polygons.output(206, 0)
+l1_nets.space(1.0.um, projection, props_ne).polygons.output(207, 0)
 
 l1_nets.drc(space(projection) < 1.0.um).polygons.output(210, 0)
 l1_nets.drc(space(projection) < 1.0.um, props_eq + props_copy).polygons.output(211, 0)
@@ -91,6 +93,8 @@ l1_nets.drc(space(projection) < 1.0.um, props_ne + props_copy).polygons.output(2
 l1_nets.drc(space(projection) < 1.0.um, props_copy).polygons.output(213, 0)
 l1_nets.drc(width(projection) < 1.0.um).polygons.output(214, 0)
 l1_nets.drc(width(projection) < 1.0.um, props_copy).polygons.output(215, 0)
+l1_nets.drc(space(projection) < 1.0.um, props_eq).polygons.output(216, 0)
+l1_nets.drc(space(projection) < 1.0.um, props_ne).polygons.output(217, 0)
 
 # edge pair to edge/polygon conversion with properties
 
@@ -104,9 +108,12 @@ l1_nets.space(1.0.um, projection, props_copy).edges.extended_in(10.nm).output(22
 
 l1_nets_sized = l1_nets.sized(0.2.um)
 l1_nets_sized.and(l1_nets_sized, props_ne + props_copy).output(300, 0)   # overlap of different nets, same layer
+l1_nets_sized.and(l1_nets_sized, props_ne).output(301, 0)
 
 l1_nets.drc(primary.sized(0.2.um) & foreign.sized(0.2.um)).output(310, 0)
 l1_nets.drc(primary.sized(0.2.um) & foreign.sized(0.2.um), props_ne + props_copy).output(311, 0)
 l1_nets.drc(primary.sized(0.2.um) & foreign.sized(0.2.um), props_eq + props_copy).output(312, 0)
 l1_nets.drc(primary.sized(0.2.um) & foreign.sized(0.2.um), props_copy).output(313, 0)
+l1_nets.drc(primary.sized(0.2.um) & foreign.sized(0.2.um), props_ne).output(314, 0)
+l1_nets.drc(primary.sized(0.2.um) & foreign.sized(0.2.um), props_eq).output(315, 0)
 
diff --git a/testdata/drc/drcSimpleTests_au70.gds b/testdata/drc/drcSimpleTests_au70.gds
index bd9736eb5..ffe5a38a3 100644
Binary files a/testdata/drc/drcSimpleTests_au70.gds and b/testdata/drc/drcSimpleTests_au70.gds differ
diff --git a/testdata/drc/drcSimpleTests_au70d.gds b/testdata/drc/drcSimpleTests_au70d.gds
index 7cac4fb6b..a4339e558 100644
Binary files a/testdata/drc/drcSimpleTests_au70d.gds and b/testdata/drc/drcSimpleTests_au70d.gds differ