diff --git a/Source/ACE.DatLoader/Entity/CBldPortal.cs b/Source/ACE.DatLoader/Entity/CBldPortal.cs
index 28ba03507f..62ae4b8ba7 100644
--- a/Source/ACE.DatLoader/Entity/CBldPortal.cs
+++ b/Source/ACE.DatLoader/Entity/CBldPortal.cs
@@ -8,9 +8,11 @@ public class CBldPortal : IUnpackable
     {
         public PortalFlags Flags { get; private set; }
 
-        // Not sure what these do. They are both calculated from the flags.
+        // Turbine's CBldPortal::UnPack decodes ExactMatch from bit 0 (0x0001),
+        // and PortalSide from the inverse of bit 1 (0x0002).
+        // The bit behavior is verified; the gameplay meaning of these flags is not.
         public bool ExactMatch => Flags.HasFlag(PortalFlags.ExactMatch);
-        public bool PortalSide => !Flags.HasFlag(PortalFlags.PortalSide);       // this->portal_side = ((unsigned __int8)~(_BYTE)v5 >> 1) & 1;
+        public bool PortalSide => !Flags.HasFlag(PortalFlags.PortalSide);
 
         // Basically the cells that connect both sides of the portal
         public ushort OtherCellId { get; private set; }
diff --git a/Source/ACE.Server/Physics/Common/BldPortal.cs b/Source/ACE.Server/Physics/Common/BldPortal.cs
index ae1746d678..50751a6504 100644
--- a/Source/ACE.Server/Physics/Common/BldPortal.cs
+++ b/Source/ACE.Server/Physics/Common/BldPortal.cs
@@ -1,4 +1,3 @@
-using System.Collections.Generic;
 using ACE.Entity.Enum;
 
 namespace ACE.Server.Physics.Common
@@ -10,7 +9,6 @@ public class BldPortal
         public bool PortalSide;
         public ushort OtherCellId;
         public ushort OtherPortalId;
-        public List<ushort> StabList;
 
         public BldPortal() { }
 
@@ -21,7 +19,6 @@ public BldPortal(DatLoader.Entity.CBldPortal bldPortal)
             PortalSide = bldPortal.PortalSide;
             OtherCellId = bldPortal.OtherCellId;
             OtherPortalId = bldPortal.OtherPortalId;
-            StabList = bldPortal.StabList;
         }
 
         public EnvCell GetOtherCell(uint landblockID)
@@ -31,32 +28,5 @@ public EnvCell GetOtherCell(uint landblockID)
             return (EnvCell)LScape.get_landcell(blockCellID);
         }
 
-        public void add_to_stablist(ref List<ushort> stabList, ref uint maxSize, ref uint stabNum)
-        {
-            // is maxSize needed with list?
-            for (var i = 0; i < StabList.Count; i++)
-            {
-                var j = (int)stabNum;
-                while (j > 0)
-                {
-                    if (StabList[i] == stabList[j - 1])
-                        break;
-                    j--;
-                }
-                if (j > 0)
-                {
-                    if (stabNum >= maxSize)
-                    {
-                        var old = stabList;
-                        stabList = new List<ushort>();
-                        maxSize += 10;
-                        foreach (var stab in StabList)
-                            stabList.Add(stab);
-                    }
-                    stabList.Add(StabList[i]);
-                    stabNum++;
-                }
-            }
-        }
     }
 }
diff --git a/Source/ACE.Server/Physics/Common/BuildingObj.cs b/Source/ACE.Server/Physics/Common/BuildingObj.cs
index ebed3716b1..00abef5149 100644
--- a/Source/ACE.Server/Physics/Common/BuildingObj.cs
+++ b/Source/ACE.Server/Physics/Common/BuildingObj.cs
@@ -30,12 +30,6 @@ public void add_to_cell(SortCell newCell)
             CurCell = newCell;
         }
 
-        public void add_to_stablist(ref List<ushort> blockStabList, ref uint maxSize, ref uint stabNum)
-        {
-            foreach (var portal in Portals)
-                portal.add_to_stablist(ref blockStabList, ref maxSize, ref stabNum);
-        }
-
         public TransitionState find_building_collisions(Transition transition)
         {
             if (PartArray == null)
diff --git a/Source/ACE.Server/Physics/Common/Landblock.cs b/Source/ACE.Server/Physics/Common/Landblock.cs
index 3fc59d53f2..f3ec5ac7c2 100644
--- a/Source/ACE.Server/Physics/Common/Landblock.cs
+++ b/Source/ACE.Server/Physics/Common/Landblock.cs
@@ -28,7 +28,6 @@ public class Landblock: LandblockStruct
         public LandblockInfo Info;
         public List<PhysicsObj> StaticObjects;
         public List<BuildingObj> Buildings;
-        public List<ushort> StabList;
         public List<LandCell> DrawArray;
         public List<PhysicsObj> Scenery;
         public List<PhysicsObj> ServerObjects { get; set; }
@@ -154,7 +153,6 @@ public void destroy_buildings()
                 building.remove();
 
             Buildings.Clear();
-            StabList.Clear();
         }
 
         public void destroy_static_objects()
@@ -426,15 +424,13 @@ public uint get_terrain(uint cellID, Vector3 point)
 
         public void grab_visible_cells()
         {
-            // legacy method
-            //EnvCell.grab_visible(StabList);
+            // Legacy visibility tracking is inactive.
         }
 
         public void init_buildings()
         {
             if (Info == null || SideCellCount != 8) return;
 
-            uint maxSize = 0, stabNum = 0;
             foreach (var info in Info.Buildings)
             {
                 var building = BuildingObj.makeBuilding(info.ModelId, info.Portals, info.NumLeaves);
@@ -451,7 +447,6 @@ public void init_buildings()
 
                 building.add_to_cell(cell); // SortCell?
                 Buildings.Add(building);
-                building.add_to_stablist(ref StabList, ref maxSize, ref stabNum);
             }
         }
 
@@ -562,8 +557,7 @@ public void release_shadow_objs()
 
         public void release_visible_cells()
         {
-            // legacy method
-            //EnvCell.release_visible(StabList);
+            // Legacy visibility tracking is inactive.
         }
 
         private bool? isDungeon;