diff --git a/EnvelopeGenerator.Web/Models/Annotation.cs b/EnvelopeGenerator.Web/Models/Annotation.cs
new file mode 100644
index 00000000..85bd0ef0
--- /dev/null
+++ b/EnvelopeGenerator.Web/Models/Annotation.cs
@@ -0,0 +1,58 @@
+namespace EnvelopeGenerator.Web.Models;
+
+public record Annotation(
+    string Id,
+    string? HorBoundAnnotId = null, string? VerBoundAnnotId = null)
+{
+    #region Layout
+    internal double _marginX = default;
+
+    internal double _marginY = default;
+
+    internal double _width = default;
+
+    internal double _height = default;
+        
+    public double MarginX
+    {
+        get => _marginX;
+        init => _marginX = value;
+    }
+
+    public double MarginY
+    {
+        get => _marginY;
+        init => _marginY = value;
+    }
+
+    public double Width
+    {
+        get => _width;
+        init => _width = value;
+    }
+
+    public double Height
+    {
+        get => _height;
+        init => _height = value;
+    }
+    #endregion
+
+    #region Pos
+    public double PosX => MarginX + (HorBoundAnnot?.HorBoundary ?? 0);
+
+    public double PosY => MarginY + (VerBoundAnnot?.VerBoundary ?? 0);
+    #endregion
+
+    #region Boundary
+    public double HorBoundary => MarginX + Width;
+
+    public double VerBoundary => MarginY + Height;
+    #endregion
+
+    #region BoundAnnot
+    public Annot? HorBoundAnnot { get; set; }
+
+    public Annot? VerBoundAnnot { get; set; }
+    #endregion
+};
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