diff --git a/src/SourceBuild/content/repo-projects/Directory.Build.targets b/src/SourceBuild/content/repo-projects/Directory.Build.targets
index 6dd4488f8..d3eca80eb 100644
--- a/src/SourceBuild/content/repo-projects/Directory.Build.targets
+++ b/src/SourceBuild/content/repo-projects/Directory.Build.targets
@@ -8,6 +8,11 @@
     <BuildArgs>$(BuildArgs) /p:CopyWipIntoInnerSourceBuildRepo=true</BuildArgs>
   </PropertyGroup>
 
+  <PropertyGroup>
+    <!-- Force use of dotnet msbuild (ignoring global.json contents) unless BuildWithDesktopMSBuild is explicitly set in the repo project. -->
+    <BuildArgs Condition="'$(BuildOS)' == 'windows' and '$(BuildWithDesktopMSBuild)' != 'true'">$(BuildArgs) $(FlagParameterPrefix)msbuildEngine dotnet</BuildArgs>
+  </PropertyGroup>
+
   <PropertyGroup>
     <BuildCommand Condition="'$(BuildCommand)' == '' and '$(IsUtilityProject)' != 'true'">$(BuildScript) $(BuildActions) $(BuildArgs)</BuildCommand>
 
@@ -36,7 +41,6 @@
     <RepositoryReference Remove="format" />
     <RepositoryReference Remove="nuget-client" />
     <RepositoryReference Remove="templating" />
-    <RepositoryReference Remove="test-templates" />
     <RepositoryReference Remove="fsharp" />
     <RepositoryReference Remove="vstest" />
     <RepositoryReference Remove="sdk" />
diff --git a/src/SourceBuild/content/repo-projects/msbuild.proj b/src/SourceBuild/content/repo-projects/msbuild.proj
index e54e9318f..bd8378b0a 100644
--- a/src/SourceBuild/content/repo-projects/msbuild.proj
+++ b/src/SourceBuild/content/repo-projects/msbuild.proj
@@ -5,9 +5,6 @@
 
     <BuildArgs>$(BuildArgs) $(FlagParameterPrefix)v $(LogVerbosity)</BuildArgs>
     <BuildArgs>$(BuildArgs) $(FlagParameterPrefix)warnAsError $(ArcadeFalseBoolBuildArg)</BuildArgs>
-
-    <!-- msbuild by default builds with desktop msbuild (xcopy-msbuild) -->
-    <BuildArgs Condition="'$(BuildOS)' == 'windows'">$(BuildArgs) $(FlagParameterPrefix)msbuildEngine dotnet</BuildArgs>
   </PropertyGroup>
 
   <ItemGroup>
diff --git a/src/SourceBuild/content/repo-projects/roslyn.proj b/src/SourceBuild/content/repo-projects/roslyn.proj
index 68d499514..5f1c34aa5 100644
--- a/src/SourceBuild/content/repo-projects/roslyn.proj
+++ b/src/SourceBuild/content/repo-projects/roslyn.proj
@@ -12,7 +12,6 @@
     <BuildScript>$(ProjectDirectory)build$(ShellExtension)</BuildScript>
 
     <!-- roslyn by default builds with desktop msbuild (xcopy-msbuild) -->
-    <BuildArgs Condition="'$(BuildOS)' == 'windows'">$(BuildArgs) $(FlagParameterPrefix)msbuildEngine dotnet</BuildArgs>
     <BuildArgs Condition="'$(BuildOS)' == 'windows'">$(BuildArgs) $(FlagParameterPrefix)officialBuildId $(OfficialBuildId)</BuildArgs>
     <BuildArgs Condition="'$(BuildOS)' == 'windows'">$(BuildArgs) $(FlagParameterPrefix)officialSkipTests true</BuildArgs>
     <BuildArgs Condition="'$(BuildOS)' == 'windows'">$(BuildArgs) $(FlagParameterPrefix)officialSkipApplyOptimizationData true</BuildArgs>
diff --git a/src/SourceBuild/content/repo-projects/wpf.proj b/src/SourceBuild/content/repo-projects/wpf.proj
index 142161497..e5ee42cc7 100644
--- a/src/SourceBuild/content/repo-projects/wpf.proj
+++ b/src/SourceBuild/content/repo-projects/wpf.proj
@@ -2,6 +2,7 @@
 
   <PropertyGroup>
     <LogVerbosityOptOut>true</LogVerbosityOptOut>
+    <BuildWithDesktopMSBuild>true</BuildWithDesktopMSBuild>
 
     <BuildArgs>$(BuildArgs) $(FlagParameterPrefix)v $(LogVerbosity)</BuildArgs>
     <BuildArgs>$(BuildArgs) $(FlagParameterPrefix)warnAsError $(ArcadeFalseBoolBuildArg)</BuildArgs>