diff --git a/devBuild.md b/devBuild.md
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+# Dev Build (DynamoRevit)
+
+## Quick start
+
+**Prerequisites**
+- VS 2022 (.NET desktop)
+- DynamoRevitUtils clone as sibling `../DynamoRevitUtils` (or set `WORKSPACE_DYNAMOREVITUTILS`)
+- [Artifactory creds](https://autodesk.atlassian.net/wiki/spaces/aeceng/pages/350564841/Setting+up+Artifactory+Credentials) as `REVIT_ARTIFACTORY_USER` / `REVIT_ARTIFACTORY_TOKEN` (or `ARTIFACTORY_USERNAME` / `ARTIFACTORY_PASSWORD`)
+
+## Upfront dependency setup (recommended)
+
+From **DynamoRevitUtils** (DRU) with D4R checked out at `../DynamoRevit`:
+
+```bat
+cd ..\DynamoRevitUtils
+RevitAPInuGet.bat
+BuildSolutions.bat
+```
+
+`RevitAPInuGet.bat` installs RevitAPI NuGet packages into `DynamoRevit\lib\Revit …\`.
+`BuildSolutions.bat` restores NuGet packages and builds the solution.
+
+## MSBuild hook (255442)
+
+`src\Directory.Build.targets` calls DRU `ensure-build-dependencies.ps1` before compile when:
+- `SkipEnsureBuildDependencies` is not `true`
+- Local Revit dev paths are not configured (`UsingLocalRevitDev`)
+- DRU helpers are found via `WORKSPACE_DYNAMOREVITUTILS` or sibling `../DynamoRevitUtils`
+
+Local CLI example:
+
+```powershell
+cd src
+$env:WORKSPACE_DYNAMOREVITUTILS = 'D:\Repos\DynamoRevitUtils'
+& "$env:ProgramFiles\Microsoft Visual Studio\2022\Professional\MSBuild\Current\Bin\MSBuild.exe" DynamoRevit.All.sln /t:Build /p:Configuration=Release /p:Platform=NET100
+```
+
+Jenkins sets `SkipEnsureBuildDependencies=true` on the Build stage because Download Dependencies already ran the ensure script.
+
+## Local Revit (no NuGet RevitAPI path)
+
+Set `REVITAPI` in `src\Config\user_local.props` to your Revit install. The MSBuild hook skips dependency download when `UsingLocalRevitDev=true`.
+
+## CI (master-3)
+
+DRU Jenkins checks out D4R at `BranchDynamoRevit` and runs Download Dependencies before Build. Durable build-deps cache lives on agent **C:** (`build-deps-cache/`); Revit RTF procure uses `revit-procure-cache/` (255441).
+
+Cross-links: [DRU PR #170](https://git.autodesk.com/Dynamo/DynamoRevitUtils/pull/170) · REVIT-255442
diff --git a/src/Directory.Build.targets b/src/Directory.Build.targets
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+++ b/src/Directory.Build.targets
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+<Project>
+  <PropertyGroup>
+    <UsingLocalRevitDev Condition="'$(UsingLocalRevitDev)' == '' AND '$(REVITAPI)' != '' AND Exists('$(REVITAPI)\RevitAPI.dll') AND !$([System.String]::Copy('$(REVITAPI)').Contains('\packages\'))">true</UsingLocalRevitDev>
+    <DruUtilsRoot Condition="'$(WORKSPACE_DYNAMOREVITUTILS)' != ''">$(WORKSPACE_DYNAMOREVITUTILS)</DruUtilsRoot>
+    <DruUtilsRoot Condition="'$(DruUtilsRoot)' == '' AND Exists('$(MSBuildThisFileDirectory)..\..\DynamoRevitUtils\build\helpers\ensure-build-dependencies.ps1')">$(MSBuildThisFileDirectory)..\..\DynamoRevitUtils</DruUtilsRoot>
+  </PropertyGroup>
+  <Target Name="EnsureBuildDependencies"
+          BeforeTargets="Build"
+          Condition="'$(DesignTimeBuild)' != 'true' AND '$(SkipEnsureBuildDependencies)' != 'true' AND '$(UsingLocalRevitDev)' != 'true' AND '$(DruUtilsRoot)' != ''">
+    <Exec Command="powershell -NoProfile -ExecutionPolicy Bypass -File &quot;$(DruUtilsRoot)\build\helpers\ensure-build-dependencies.ps1&quot; -WorkspaceRoot &quot;$(MSBuildThisFileDirectory)..&quot;"
+          IgnoreExitCode="false"
+          StandardOutputImportance="High"
+          StandardErrorImportance="High" />
+  </Target>
+</Project>