diff --git a/include/sta/NullParasitics.hh b/include/sta/NullParasitics.hh
index 7c975e7f..6256849e 100644
--- a/include/sta/NullParasitics.hh
+++ b/include/sta/NullParasitics.hh
@@ -97,6 +97,7 @@ public:
   virtual bool includesPinCaps(Parasitic *parasitic) const;
   virtual void deleteParasiticNetwork(const Net *net,
 				      const ParasiticAnalysisPt *ap);
+  virtual void deleteParasiticNetworks(const Net *net);
   virtual ParasiticNode *ensureParasiticNode(Parasitic *parasitic,
 					     const Net *net,
 					     int id);
diff --git a/include/sta/Parasitics.hh b/include/sta/Parasitics.hh
index b3003760..b548eef4 100644
--- a/include/sta/Parasitics.hh
+++ b/include/sta/Parasitics.hh
@@ -155,6 +155,7 @@ public:
   // Delete parasitic network if it exists.
   virtual void deleteParasiticNetwork(const Net *net,
 				      const ParasiticAnalysisPt *ap) = 0;
+  virtual void deleteParasiticNetworks(const Net *net) = 0;
   // True if the parasitic network caps include pin capacitances.
   virtual bool includesPinCaps(Parasitic *parasitic) const = 0;
   // Parasitic network component builders.
diff --git a/parasitics/ConcreteParasitics.cc b/parasitics/ConcreteParasitics.cc
index ff1ce01b..5da55bc7 100644
--- a/parasitics/ConcreteParasitics.cc
+++ b/parasitics/ConcreteParasitics.cc
@@ -1340,7 +1340,30 @@ ConcreteParasitics::deleteParasiticNetwork(const Net *net,
     if (parasitics) {
       int ap_index = ap->index();
       delete parasitics[ap_index];
-      parasitics[ap_index] = nullptr;
+      int ap_count = corners_->parasiticAnalysisPtCount();
+      if (ap_count == 1) {
+        // If there is only one parasitic we can remove the array and map entry.
+        delete [] parasitics;
+        parasitic_network_map_.erase(net);
+      }
+      else
+        parasitics[ap_index] = nullptr;
+    }
+  }
+}
+
+void
+ConcreteParasitics::deleteParasiticNetworks(const Net *net)
+{
+  if (!parasitic_network_map_.empty()) {
+    UniqueLock lock(lock_);
+    ConcreteParasiticNetwork **parasitics = parasitic_network_map_.findKey(net);
+    if (parasitics) {
+      int ap_count = corners_->parasiticAnalysisPtCount();
+      for (int i = 0; i < ap_count; i++)
+	delete parasitics[i];
+      delete [] parasitics;
+      parasitic_network_map_.erase(net);
     }
   }
 }
diff --git a/parasitics/ConcreteParasitics.hh b/parasitics/ConcreteParasitics.hh
index 0ac78c5b..f777a1bb 100644
--- a/parasitics/ConcreteParasitics.hh
+++ b/parasitics/ConcreteParasitics.hh
@@ -106,6 +106,7 @@ public:
 					  const ParasiticAnalysisPt *ap);
   virtual void deleteParasiticNetwork(const Net *net,
 				      const ParasiticAnalysisPt *ap);
+  virtual void deleteParasiticNetworks(const Net *net);
   virtual bool includesPinCaps(Parasitic *parasitic) const;
   virtual ParasiticNode *ensureParasiticNode(Parasitic *parasitic,
 					     const Net *net,
diff --git a/parasitics/NullParasitics.cc b/parasitics/NullParasitics.cc
index a39076ae..2e0ccfe7 100644
--- a/parasitics/NullParasitics.cc
+++ b/parasitics/NullParasitics.cc
@@ -245,6 +245,11 @@ NullParasitics::deleteParasiticNetwork(const Net *,
 {
 }
 
+void
+NullParasitics::deleteParasiticNetworks(const Net *)
+{
+}
+
 ParasiticNode *
 NullParasitics::ensureParasiticNode(Parasitic *,
 				    const Net *,