diff --git a/Plant3D2026/P_Rec_Annot/Directory.Build.props b/Plant3D2026/P_Rec_Annot/Directory.Build.props
index 6ffcf3b..20189b8 100644
--- a/Plant3D2026/P_Rec_Annot/Directory.Build.props
+++ b/Plant3D2026/P_Rec_Annot/Directory.Build.props
@@ -1,4 +1,5 @@
 <Project>
+  <Import Project="Local.Build.props" Condition="Exists('Local.Build.props')" />
   <PropertyGroup>
     <Nullable>enable</Nullable>
     <ImplicitUsings>enable</ImplicitUsings>
@@ -9,5 +10,8 @@
     <AutoCAD2026ManagedDir Condition="'$(AutoCAD2026ManagedDir)' == '' and '$(Plant3D2026InstallDir)' != ''">$(Plant3D2026InstallDir)</AutoCAD2026ManagedDir>
     <Plant3D2026ManagedDir Condition="'$(Plant3D2026ManagedDir)' == '' and '$(Plant3D2026InstallDir)' != ''">$(Plant3D2026InstallDir)\PLNT3D</Plant3D2026ManagedDir>
     <Plant3D2026InstallDir Condition="'$(Plant3D2026InstallDir)' == '' and '$(AutoCAD2026ManagedDir)' != ''">$(AutoCAD2026ManagedDir)</Plant3D2026InstallDir>
+    <Plant3D2026StandardInstallDir Condition="'$(Plant3D2026StandardInstallDir)' == ''">$(ProgramW6432)\Autodesk\AutoCAD 2026</Plant3D2026StandardInstallDir>
+    <AutoCAD2026ManagedDir Condition="'$(AutoCAD2026ManagedDir)' == '' and Exists('$(Plant3D2026StandardInstallDir)\AcMgd.dll')">$(Plant3D2026StandardInstallDir)</AutoCAD2026ManagedDir>
+    <Plant3D2026ManagedDir Condition="'$(Plant3D2026ManagedDir)' == '' and Exists('$(Plant3D2026StandardInstallDir)\PLNT3D\PnPProjectManagerMgd.dll')">$(Plant3D2026StandardInstallDir)\PLNT3D</Plant3D2026ManagedDir>
   </PropertyGroup>
 </Project>
diff --git a/Plant3D2026/P_Rec_Annot/docs/build.md b/Plant3D2026/P_Rec_Annot/docs/build.md
index 93c5704..b03086a 100644
--- a/Plant3D2026/P_Rec_Annot/docs/build.md
+++ b/Plant3D2026/P_Rec_Annot/docs/build.md
@@ -1,5 +1,11 @@
 # Build
 
+References resolve in this order: explicit `AutoCAD2026ManagedDir` and
+`Plant3D2026ManagedDir`, an untracked `Local.Build.props`, then the validated
+standard Plant 3D 2026 install directory. No Autodesk binary is copied into the
+repository or bundle. If discovery does not find all required assemblies, pass
+the explicit properties shown below.
+
 The workstation has .NET SDK 8.0.423 and Autodesk AutoCAD Plant 3D 2026 installed. The paths are deliberately supplied at build time; no machine-specific Autodesk path is stored in project files.
 
 Detected assembly inventory: