diff --git a/src/SourceBuild/content/Directory.Build.targets b/src/SourceBuild/content/Directory.Build.targets
index 183f0d154973..2c9efb5d2102 100644
--- a/src/SourceBuild/content/Directory.Build.targets
+++ b/src/SourceBuild/content/Directory.Build.targets
@@ -34,6 +34,34 @@
     </PropertyGroup>
   </Target>
 
+  <Target Name="DetermineSourceBuiltRuntimeVersion">
+    <PropertyGroup>
+      <RuntimeFilenamePrefix>dotnet-runtime-</RuntimeFilenamePrefix>
+    </PropertyGroup>
+
+    <ItemGroup>
+      <RuntimeArchiveItem Include="$(ArtifactsAssetsDir)Runtime/**/$(RuntimeFilenamePrefix)*$(ArchiveExtension)"
+                          Exclude="$(ArtifactsAssetsDir)Runtime/**/$(RuntimeFilenamePrefix)*.wixpack.zip" />
+    </ItemGroup>
+
+    <Error Text="Didn't find a runtime archive." Condition="'@(RuntimeArchiveItem)' == ''" />
+    <Error Text="Found more than one runtime archive." Condition="@(RuntimeArchiveItem->Count()) &gt; 1" />
+
+    <!--
+      Extract runtime version from the dotnet-runtime archive filename.
+      Keep in sync with dotnet-runtime's archive location and filename.
+
+      Example:
+      artifacts\assets\<config>\Runtime\9.0.100-alpha.1.24057.1\dotnet-runtime-9.0.100-alpha.1.24057.1-fedora.38-x64.tar.gz
+      artifacts\assets\<config>\Runtime\<RuntimeVersion>\dotnet-runtime-<RuntimeVersion>-<TargetRid><ArchiveExtension>
+    -->
+    <PropertyGroup>
+      <RuntimeFilename>%(RuntimeArchiveItem.Filename)%(RuntimeArchiveItem.Extension)</RuntimeFilename>
+      <RuntimeArchivePath>%(RuntimeArchiveItem.Identity)</RuntimeArchivePath>
+      <SourceBuiltRuntimeVersion>$(RuntimeFilename.Replace('$(RuntimeFilenamePrefix)','').Replace('-$(TargetRid)$(ArchiveExtension)',''))</SourceBuiltRuntimeVersion>
+    </PropertyGroup>
+  </Target>
+
   <ItemGroup>
     <!-- Binplace all assets and packages to ArtifactsStagingDir. -->
     <BinPlaceDir Include="$(ArtifactsStagingDir)" Condition="'$(ArtifactsStagingDir)' != ''" />
diff --git a/src/SourceBuild/content/eng/Version.Details.xml b/src/SourceBuild/content/eng/Version.Details.xml
index 809c1a92f7b2..52411253c623 100644
--- a/src/SourceBuild/content/eng/Version.Details.xml
+++ b/src/SourceBuild/content/eng/Version.Details.xml
@@ -2,9 +2,9 @@
   <ProductDependencies>
   </ProductDependencies>
   <ToolsetDependencies>
-    <Dependency Name="Microsoft.DotNet.Arcade.Sdk" Version="10.0.0-beta.25076.1">
+    <Dependency Name="Microsoft.DotNet.Arcade.Sdk" Version="10.0.0-beta.25103.6">
       <Uri>https://github.com/dotnet/arcade</Uri>
-      <Sha>fe17712bedb95a55d5af00c5191772c81393745f</Sha>
+      <Sha>0b971a5e11be58af22ca83fbc111a1207bb62920</Sha>
     </Dependency>
   </ToolsetDependencies>
 </Dependencies>
diff --git a/src/SourceBuild/content/eng/Versions.props b/src/SourceBuild/content/eng/Versions.props
index 62928dd47dd9..0da82f9cd4a9 100644
--- a/src/SourceBuild/content/eng/Versions.props
+++ b/src/SourceBuild/content/eng/Versions.props
@@ -23,8 +23,8 @@
       of a .NET major or minor release, prebuilts may be needed. When the release is mature, prebuilts
       are not necessary, and this property is removed from the file.
     -->
-    <PrivateSourceBuiltSdkVersion>10.0.100-preview.1.25078.1</PrivateSourceBuiltSdkVersion>
-    <PrivateSourceBuiltArtifactsVersion>10.0.100-preview.1.25078.1</PrivateSourceBuiltArtifactsVersion>
+    <PrivateSourceBuiltSdkVersion>10.0.100-preview.2.25105.1</PrivateSourceBuiltSdkVersion>
+    <PrivateSourceBuiltArtifactsVersion>10.0.100-preview.2.25105.1</PrivateSourceBuiltArtifactsVersion>
     <!-- command-line-api dependencies -->
     <SystemCommandLineVersion>2.0.0-beta4.24126.1</SystemCommandLineVersion>
     <!-- msbuild dependencies -->
diff --git a/src/SourceBuild/content/global.json b/src/SourceBuild/content/global.json
index 5668264000d8..fa5eb069202d 100644
--- a/src/SourceBuild/content/global.json
+++ b/src/SourceBuild/content/global.json
@@ -1,10 +1,10 @@
 {
   "tools": {
-    "dotnet": "10.0.100-preview.1.25078.4"
+    "dotnet": "10.0.100-preview.2.25104.28"
   },
   "msbuild-sdks": {
     "Microsoft.Build.NoTargets": "3.7.0",
     "Microsoft.Build.Traversal": "3.4.0",
-    "Microsoft.DotNet.Arcade.Sdk": "10.0.0-beta.25076.1"
+    "Microsoft.DotNet.Arcade.Sdk": "10.0.0-beta.25103.6"
   }
 }
diff --git a/src/SourceBuild/content/repo-projects/Directory.Build.props b/src/SourceBuild/content/repo-projects/Directory.Build.props
index 5859110e7fe7..d58e9a6777ef 100644
--- a/src/SourceBuild/content/repo-projects/Directory.Build.props
+++ b/src/SourceBuild/content/repo-projects/Directory.Build.props
@@ -87,39 +87,45 @@
     <BuildActions>$(BuildActions) $(FlagParameterPrefix)publish</BuildActions>
     <BuildActions Condition="'$(Sign)' == 'true'">$(BuildActions) $(FlagParameterPrefix)sign</BuildActions>
 
+    <TestActions>$(FlagParameterPrefix)test</TestActions>
+  </PropertyGroup>
+
+  <!-- Common args used for building and testing. -->
+  <PropertyGroup>
     <!-- TODO: Remove the DotNetBuildSourceOnly condition when the default build behavior for source-only builds changes to dev.
          https://github.com/dotnet/source-build/issues/4855 -->
-    <BuildArgs Condition="'$(ContinuousIntegrationBuild)' == 'true' or '$(DotNetBuildSourceOnly)' == 'true'">$(FlagParameterPrefix)ci</BuildArgs>
-    <BuildArgs>$(BuildArgs) $(FlagParameterPrefix)configuration $(Configuration)</BuildArgs>
-    <BuildArgs>$(BuildArgs) -bl</BuildArgs>
-    <BuildArgs>$(BuildArgs) /p:DotNetBuildRepo=true</BuildArgs>
-
-    <!-- Indicate that the build is being run from the orchestrator -->
-    <BuildArgs>$(BuildArgs) /p:DotNetBuildOrchestrator=true</BuildArgs>
+    <CommonArgs Condition="'$(ContinuousIntegrationBuild)' == 'true' or '$(DotNetBuildSourceOnly)' == 'true'">$(FlagParameterPrefix)ci</CommonArgs>
+    <CommonArgs>$(CommonArgs) $(FlagParameterPrefix)configuration $(Configuration)</CommonArgs>
 
     <!-- Pass down configuration properties -->
-    <BuildArgs>$(BuildArgs) /p:TargetRid=$(TargetRid)</BuildArgs>
+    <CommonArgs>$(CommonArgs) /p:TargetRid=$(TargetRid)</CommonArgs>
 
     <!-- Pass through DotNetBuildPass for join point vertical support. -->
-    <BuildArgs Condition="'$(DotNetBuildPass)' != '' and '$(DotNetBuildPass)' != '1'">$(BuildArgs) /p:DotNetBuildPass=$(DotNetBuildPass)</BuildArgs>
+    <CommonArgs Condition="'$(DotNetBuildPass)' != '' and '$(DotNetBuildPass)' != '1'">$(CommonArgs) /p:DotNetBuildPass=$(DotNetBuildPass)</CommonArgs>
 
     <!-- Only pass these properites through when necessary to reduce command line noise. -->
-    <BuildArgs Condition="'$(CrossBuild)' == 'true'">$(BuildArgs) /p:CrossBuild=true</BuildArgs>
-    <BuildArgs Condition="'$(NuGetConfigFile)' != ''">$(BuildArgs) /p:RestoreConfigFile=$(NuGetConfigFile)</BuildArgs>
-    <BuildArgs Condition="'$(DotNetBuildUseMonoRuntime)' == 'true'">$(BuildArgs) /p:DotNetBuildUseMonoRuntime=$(DotNetBuildUseMonoRuntime)</BuildArgs>
-    <BuildArgs Condition="'$(OfficialBuildId)' != ''">$(BuildArgs) /p:OfficialBuildId=$(OfficialBuildId)</BuildArgs>
-    <BuildArgs Condition="'$(ForceDryRunSigning)' != ''">$(BuildArgs) /p:ForceDryRunSigning=$(ForceDryRunSigning)</BuildArgs>
+    <CommonArgs Condition="'$(CrossBuild)' == 'true'">$(CommonArgs) /p:CrossBuild=true</CommonArgs>
+    <CommonArgs Condition="'$(DotNetBuildUseMonoRuntime)' == 'true'">$(CommonArgs) /p:DotNetBuildUseMonoRuntime=$(DotNetBuildUseMonoRuntime)</CommonArgs>
+    <CommonArgs Condition="'$(OfficialBuildId)' != ''">$(CommonArgs) /p:OfficialBuildId=$(OfficialBuildId)</CommonArgs>
+    <CommonArgs Condition="'$(ForceDryRunSigning)' != ''">$(CommonArgs) /p:ForceDryRunSigning=$(ForceDryRunSigning)</CommonArgs>
 
     <!-- Pass locations for assets -->
-    <BuildArgs>$(BuildArgs) /p:SourceBuiltAssetsDir=$(ArtifactsAssetsDir)</BuildArgs>
-    <BuildArgs>$(BuildArgs) /p:SourceBuiltAssetManifestsDir=$(RepoAssetManifestsDir)</BuildArgs>
+    <CommonArgs>$(CommonArgs) /p:SourceBuiltAssetsDir=$(ArtifactsAssetsDir)</CommonArgs>
+    <CommonArgs>$(CommonArgs) /p:SourceBuiltAssetManifestsDir=$(RepoAssetManifestsDir)</CommonArgs>
 
     <!-- PGO assets by default are "Vertical" visibilty. Each repo will enable the specific artifacts it must publish externally -->
-    <BuildArgs Condition="'$(PgoInstrument)' == 'true'">$(BuildArgs) /p:DefaultArtifactVisibility=Vertical</BuildArgs>
+    <CommonArgs Condition="'$(PgoInstrument)' == 'true'">$(CommonArgs) /p:DefaultArtifactVisibility=Vertical</CommonArgs>
     <!-- ShortStack builds only publish new assets from the root repository. All other assets are duplicates. -->
-    <BuildArgs Condition="'$(ShortStack)' == 'true' and '$(MSBuildProjectName)' != '$(RootRepo)'">$(BuildArgs) /p:DefaultArtifactVisibility=Vertical</BuildArgs>
+    <CommonArgs Condition="'$(ShortStack)' == 'true' and '$(MSBuildProjectName)' != '$(RootRepo)'">$(CommonArgs) /p:DefaultArtifactVisibility=Vertical</CommonArgs>
   </PropertyGroup>
 
+  <!-- Build specific args -->
+  <PropertyGroup>
+    <BuildArgs>$(BuildArgs) -bl</BuildArgs>
+    <!-- Don't flow these control properties during testing to avoid the outer/inner complexity. -->
+    <BuildArgs>$(BuildArgs) /p:DotNetBuildRepo=true</BuildArgs>
+    <BuildArgs>$(BuildArgs) /p:DotNetBuildOrchestrator=true</BuildArgs>
+  </PropertyGroup>
   <PropertyGroup Condition="'$(DotNetBuildSourceOnly)' == 'true'">
     <BuildArgs>$(BuildArgs) /p:SourceBuiltSymbolsDir=$(IntermediateSymbolsRepoDir)</BuildArgs>
     <BuildArgs>$(BuildArgs) /p:DotNetBuildSourceOnly=true</BuildArgs>
@@ -127,14 +133,8 @@
     <BuildArgs>$(BuildArgs) /p:ReferencePackageNupkgCacheDir="$(ReferencePackagesDir)"</BuildArgs>
   </PropertyGroup>
 
+  <!-- Test specific args-->
   <PropertyGroup>
-    <TestActions>$(FlagParameterPrefix)restore</TestActions>
-    <TestActions>$(TestActions) $(FlagParameterPrefix)test</TestActions>
-
-    <!-- TODO: Remove the DotNetBuildSourceOnly condition when the default build behavior for source-only builds changes to dev.
-         https://github.com/dotnet/source-build/issues/4855 -->
-    <TestArgs Condition="'$(ContinuousIntegrationBuild)' == 'true' or '$(DotNetBuildSourceOnly)' == 'true'">$(FlagParameterPrefix)ci</TestArgs>
-    <TestArgs>$(TestArgs) $(FlagParameterPrefix)configuration $(Configuration)</TestArgs>
     <TestArgs>$(TestArgs) /bl:$(ArtifactsLogRepoDir)Test.binlog</TestArgs>
   </PropertyGroup>
 
@@ -147,15 +147,11 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <!-- TODO: Remove once net10.0 migration is complete -->
-    <EnvironmentVariables Include="SuppressTfmSupportBuildWarnings=True" />
-
     <!-- Arcade tools.sh picks up DotNetCoreSdkDir, but we can pass DOTNET_INSTALL_DIR directly. -->
     <EnvironmentVariables Include="DOTNET_INSTALL_DIR=$(DotNetRoot)" />
     <EnvironmentVariables Include="DOTNET_PATH=$(DotNetRoot)" />
     <EnvironmentVariables Include="DOTNET_HOST_PATH=$(DotNetTool)" />
 
-    <!-- _InitializeDotNetCli is used by websdk and templating to decide whether to init the SDK -->
     <EnvironmentVariables Include="_InitializeDotNetCli=$(DotNetRoot.TrimEnd('/\'))" />
     <EnvironmentVariables Include="_DotNetInstallDir=$(DotNetRoot)" />
     <EnvironmentVariables Include="_InitializeToolset=$(SourceBuiltSdksDir)Microsoft.DotNet.Arcade.Sdk/tools/Build.proj"
@@ -185,7 +181,6 @@
     <!-- Need to be passed in here so that outer and inner builds don't restore into the orchestrator package cache (CI builds)
          or the user package cache (local dev builds). -->
     <EnvironmentVariables Include="NUGET_PACKAGES=$(RepoArtifactsPackageCache)" />
-    <TestEnvironmentVariable Include="NUGET_PACKAGES=$(RepoArtifactsPackageCache)" />
   </ItemGroup>
 
   <ItemGroup  Condition="'$(DotNetBuildSourceOnly)' == 'true'">
diff --git a/src/SourceBuild/content/repo-projects/Directory.Build.targets b/src/SourceBuild/content/repo-projects/Directory.Build.targets
index 1ded130d42f8..a9889433364e 100644
--- a/src/SourceBuild/content/repo-projects/Directory.Build.targets
+++ b/src/SourceBuild/content/repo-projects/Directory.Build.targets
@@ -3,9 +3,9 @@
   <Import Project="$([MSBuild]::GetPathOfFileAbove(Directory.Build.targets, $(MSBuildThisFileDirectory)..))" />
 
   <PropertyGroup Condition="'$(UseInnerClone)' == 'true'">
-    <BuildArgs>$(BuildArgs) /p:UseInnerClone=true</BuildArgs>
-    <BuildArgs>$(BuildArgs) /p:CopySrcInsteadOfClone=true</BuildArgs>
-    <BuildArgs>$(BuildArgs) /p:CopyWipIntoInnerSourceBuildRepo=true</BuildArgs>
+    <CommonArgs>$(CommonArgs) /p:UseInnerClone=true</CommonArgs>
+    <CommonArgs>$(CommonArgs) /p:CopySrcInsteadOfClone=true</CommonArgs>
+    <CommonArgs>$(CommonArgs) /p:CopyWipIntoInnerSourceBuildRepo=true</CommonArgs>
   </PropertyGroup>
 
   <PropertyGroup>
@@ -13,7 +13,8 @@
     <DiskUsageCommand Condition="'$(BuildOS)' != 'windows'">df -h $(RepoRoot)</DiskUsageCommand>
 
     <!-- Force use of dotnet msbuild (ignoring global.json contents) unless ForceDotNetMSBuildEngine is explicitly set in the repo project. -->
-    <BuildArgs Condition="'$(BuildOS)' == 'windows' and '$(ForceDotNetMSBuildEngine)' != 'false'">$(BuildArgs) $(FlagParameterPrefix)msbuildEngine dotnet</BuildArgs>
+    <CommonArgs Condition="'$(BuildOS)' == 'windows' and '$(ForceDotNetMSBuildEngine)' != 'false'">$(CommonArgs) $(FlagParameterPrefix)msbuildEngine dotnet</CommonArgs>
+
     <!-- Add the overrides for the shipping and non-shipping packages here to allow repo projects to identify a project as reference-only -->
     <RepoArtifactsShippingPackagesDir Condition="'$(ReferenceOnlyRepoArtifacts)' != 'true'">$([MSBuild]::NormalizeDirectory('$(ArtifactsShippingPackagesDir)', '$(RepositoryName)'))</RepoArtifactsShippingPackagesDir>
     <RepoArtifactsShippingPackagesDir Condition="'$(ReferenceOnlyRepoArtifacts)' == 'true'">$(ReferencePackagesDir)</RepoArtifactsShippingPackagesDir>
@@ -21,9 +22,9 @@
     <RepoArtifactsNonShippingPackagesDir Condition="'$(ReferenceOnlyRepoArtifacts)' == 'true'">$(ReferencePackagesDir)</RepoArtifactsNonShippingPackagesDir>
 
     <!-- Pass location for packages -->
-    <BuildArgs>$(BuildArgs) /p:SourceBuiltShippingPackagesDir=$(RepoArtifactsShippingPackagesDir)</BuildArgs>
+    <CommonArgs>$(CommonArgs) /p:SourceBuiltShippingPackagesDir=$(RepoArtifactsShippingPackagesDir)</CommonArgs>
     <!-- Trim the trailing slash as it breaks argument parsing on Windows if this is the last argument. -->
-    <BuildArgs>$(BuildArgs) /p:SourceBuiltNonShippingPackagesDir=$(RepoArtifactsNonShippingPackagesDir.TrimEnd('\'))</BuildArgs>
+    <CommonArgs>$(CommonArgs) /p:SourceBuiltNonShippingPackagesDir=$(RepoArtifactsNonShippingPackagesDir.TrimEnd('\'))</CommonArgs>
 
     <!-- Pass RID and Portable/non-portable information -->
     <_platformIndex>$(NETCoreSdkRuntimeIdentifier.LastIndexOf('-'))</_platformIndex>
@@ -31,12 +32,12 @@
 
     <_platformIndex>$(NETCoreSdkPortableRuntimeIdentifier.LastIndexOf('-'))</_platformIndex>
     <BaseOS>$(NETCoreSdkPortableRuntimeIdentifier.Substring(0, $(_platformIndex)))-$(TargetArchitecture)</BaseOS>
-    <BuildArgs>$(BuildArgs) /p:PortableBuild=$(PortableBuild)</BuildArgs>
-    <BuildArgs Condition="'$(ShortStack)' != 'true' and '$(TargetOS)' != 'linux-musl'">$(BuildArgs) /p:RuntimeOS=$(RuntimeOS)</BuildArgs>
-    <BuildArgs Condition="'$(ShortStack)' != 'true' and '$(TargetOS)' != 'linux-musl'">$(BuildArgs) /p:BaseOS=$(BaseOS)</BuildArgs>
+    <CommonArgs>$(CommonArgs) /p:PortableBuild=$(PortableBuild)</CommonArgs>
+    <CommonArgs Condition="'$(ShortStack)' != 'true' and '$(TargetOS)' != 'linux-musl'">$(CommonArgs) /p:RuntimeOS=$(RuntimeOS)</CommonArgs>
+    <CommonArgs Condition="'$(ShortStack)' != 'true' and '$(TargetOS)' != 'linux-musl'">$(CommonArgs) /p:BaseOS=$(BaseOS)</CommonArgs>
 
-    <!-- Only pass when enabled to reduce command line noise. -->
-    <BuildArgs Condition="'$(DotNetBuildTests)' == 'true' and '$(DotNetBuildTestsOptOut)' != 'true'">$(BuildArgs) /p:DotNetBuildTests=true</BuildArgs>
+    <!-- Only pass these properites through when necessary to reduce command line noise. -->
+    <CommonArgs Condition="'$(DotNetBuildTests)' == 'true' and '$(DotNetBuildTestsOptOut)' != 'true'">$(CommonArgs) /p:DotNetBuildTests=true</CommonArgs>
   </PropertyGroup>
 
   <PropertyGroup>
@@ -133,14 +134,12 @@
   </Target>
 
   <Target Name="CopyNuGetConfig"
-          Condition="'$(NuGetConfigFile)' != ''"
-          Inputs="$(MSBuildProjectFullPath);$(OriginalNuGetConfigFile)"
-          Outputs="$(NuGetConfigFile)">
-
+          Condition="'$(NuGetConfigFile)' != ''">
     <MakeDir Directories="$([System.IO.Path]::GetDirectoryName('$(NuGetConfigFile)'))" />
 
     <Copy SourceFiles="$(OriginalNuGetConfigFile)"
-          DestinationFiles="$(NuGetConfigFile)">
+          DestinationFiles="$(NuGetConfigFile)"
+          SkipUnchangedFiles="true">
       <Output TaskParameter="CopiedFiles" ItemName="FileWrites" />
     </Copy>
   </Target>
@@ -410,8 +409,7 @@
              Condition="'@(_DependentProjectToSkip)' != ''" />
   </Target>
 
-  <Target Name="DiscoverBuiltSdkOverrides"
-          DependsOnTargets="BuildRepoReferences;GetProducedPackagesFromTransitiveReferences">
+  <Target Name="DiscoverBuiltSdkOverrides" DependsOnTargets="GetProducedPackagesFromTransitiveReferences">
     <!--
       Discover the Arcade SDKs built from the live Arcade source and set them as overrides here.
       This will automatically no-op for Arcade and SBRP, as these packages will not have been produced yet.
@@ -469,7 +467,7 @@
            ProcessFrameworkReferences not be able to restore for the given RID.  -->
       <BuildArgs Condition="'$(DotNetBuildSourceOnly)' != 'true' and '@(TransitiveRepositoryReference->AnyHaveMetadataValue('Identity', 'runtime'))' == 'true'">$(BuildArgs) /p:DotNetBuildTargetRidOnly=true</BuildArgs>
 
-      <BuildCommand Condition="'$(BuildCommand)' == '' and '$(IsUtilityProject)' != 'true'">$(BuildScript) $(BuildActions) $(BuildArgs)</BuildCommand>
+      <BuildCommand Condition="'$(BuildCommand)' == '' and '$(IsUtilityProject)' != 'true'">$(BuildScript) $(BuildActions) $(CommonArgs) $(BuildArgs)</BuildCommand>
     </PropertyGroup>
   </Target>
 
@@ -492,6 +490,7 @@
     <Message Importance="High" Text="  Log: $(RepoConsoleLogFile)" Condition="'$(MinimalConsoleLogOutput)' == 'true'" />
     <Message Importance="High" Text="  With Environment Variables:"/>
     <Message Importance="High" Text="    %(EnvironmentVariables.Identity)" />
+    <Message Importance="High" Text="    %(BuildEnvironmentVariable.Identity)" Condition="'@(BuildEnvironmentVariable)' != ''" />
 
     <Message Text="DirSize Before Building $(RepositoryName)" Importance="High" Condition=" '$(CleanWhileBuilding)' == 'true'" />
     <Exec Command="$(DiskUsageCommand)" Condition="'$(CleanWhileBuilding)' == 'true'" />
@@ -513,7 +512,7 @@
 
     <Exec Command="$(FullCommand)"
           WorkingDirectory="$(ProjectDirectory)"
-          EnvironmentVariables="@(EnvironmentVariables)"
+          EnvironmentVariables="@(EnvironmentVariables);@(BuildEnvironmentVariable)"
           IgnoreStandardErrorWarningFormat="true">
       <Output TaskParameter="ExitCode" PropertyName="RepoBuildExitCode" />
     </Exec>
@@ -683,7 +682,7 @@
 
       Don't run when source building to prevent the build from hanging indefinitely - https://github.com/dotnet/source-build/issues/4796
     -->
-    <Exec Command="$(DotnetTool) build-server shutdown --vbcscompiler"
+    <Exec Command="$(DotNetTool) build-server shutdown --vbcscompiler"
           Condition="'$(DotNetBuildSourceOnly)' != 'true'"
           EnvironmentVariables="NUGET_PACKAGES=$(RepoArtifactsPackageCache)"
           IgnoreStandardErrorWarningFormat="true"
@@ -772,16 +771,19 @@
     MoveDotNetBuildLogs;
     CleanupRepo" />
 
-  <Target Name="RepoTest">
+  <Target Name="RepoTest"
+          DependsOnTargets="DiscoverBuiltSdkOverrides;
+                            SetSourceBuiltSdkOverrides">
     <PropertyGroup>
-      <TestCommand>$(BuildScript) $(TestActions) $(TestArgs)</TestCommand>
+      <TestCommand>$(BuildScript) $(TestActions) $(CommonArgs) $(TestArgs)</TestCommand>
     </PropertyGroup>
 
     <Message Importance="High" Text="[$([System.DateTime]::Now.ToString('HH:mm:ss.ff'))] Testing $(RepositoryName)" />
     <Message Importance="High" Text="Running command:" />
     <Message Importance="High" Text="  $(TestCommand)" />
     <Message Importance="High" Text="  With Environment Variables:"/>
-    <Message Importance="High" Text="    %(TestEnvironmentVariable.Identity)" />
+    <Message Importance="High" Text="    %(EnvironmentVariables.Identity)" />
+    <Message Importance="High" Text="    %(TestEnvironmentVariable.Identity)" Condition="'@(TestEnvironmentVariable)' != ''" />
 
     <PropertyGroup>
       <FullTestCommand>$(TestCommand)</FullTestCommand>
@@ -790,7 +792,7 @@
 
     <Exec Command="$(FullTestCommand)"
           WorkingDirectory="$(ProjectDirectory)"
-          EnvironmentVariables="@(TestEnvironmentVariable)">
+          EnvironmentVariables="@(EnvironmentVariables);@(TestEnvironmentVariable)">
       <Output TaskParameter="ExitCode" PropertyName="RepoTestExitCode" />
     </Exec>
 
@@ -799,7 +801,10 @@
     <OnError ExecuteTargets="MoveDotNetBuildLogs" />
   </Target>
 
-  <Target Name="Test" DependsOnTargets="RepoTest;MoveDotNetBuildLogs" />
+  <Target Name="Test"
+          DependsOnTargets="RepoTest;
+                            MoveDotNetBuildLogs;
+                            CleanupRepo" />
   <Target Name="VSTest" DependsOnTargets="Test" />
 
   <UsingTask TaskName="Microsoft.DotNet.UnifiedBuild.Tasks.UsageReport.WritePackageUsageData" AssemblyFile="$(MicrosoftDotNetUnifiedBuildTasksAssembly)" TaskFactory="TaskHostFactory" />
diff --git a/src/SourceBuild/content/repo-projects/scenario-tests.proj b/src/SourceBuild/content/repo-projects/scenario-tests.proj
index 2acd2f8bf0b7..0ed6c71739ed 100644
--- a/src/SourceBuild/content/repo-projects/scenario-tests.proj
+++ b/src/SourceBuild/content/repo-projects/scenario-tests.proj
@@ -4,17 +4,19 @@
     <!-- The scenario-tests repo shouldn't be cleaned after building as we run tests from it. -->
     <CleanWhileBuilding>false</CleanWhileBuilding>
 
-    <ScenarioTestsResultsDir>$([MSBuild]::NormalizeDirectory('$(ArtifactsTestResultsDir)', 'scenario-tests'))</ScenarioTestsResultsDir>
-    
-    <TestArgs>$(TestArgs) /p:TestBinlogDir=$(ArtifactsLogRepoDir)</TestArgs>
-    <!-- Pass the path of the updated NuGet.config file in which contains the live source-built feeds. Skip this when building source-only
-         as in that configuration we currently don't want to use the live generated NuGet packages from the various repositories. -->
-    <TestArgs Condition="'$(NuGetConfigFile)' != '' and '$(DotNetBuildSourceOnly)' != 'true'">$(TestArgs) /p:RestoreConfigFile=$(NuGetConfigFile)</TestArgs>
+    <TestArgs>$(TestArgs) /p:TestBinlogDir="$(ArtifactsLogRepoDir.TrimEnd('/\'))"</TestArgs>
+    <TestArgs>$(TestArgs) /p:TestDotNetRoot="$(DotNetSdkExtractDir.TrimEnd('/\'))"</TestArgs>
+
+    <!-- Don't use the updated NuGet.config file that includes the live package feeds when testing source-only as in that configuration
+         the Microsoft built packages should be used. -->
+    <TestArgs Condition="'$(DotNetBuildSourceOnly)' == 'true'">$(TestArgs) /p:TestRestoreConfigFile=$(OriginalNuGetConfigFile)</TestArgs>
   </PropertyGroup>
 
   <ItemGroup>
     <RepositoryReference Include="arcade" />
     <RepositoryReference Include="command-line-api" />
+    <!-- Depend on NuGet packages from the sdk repo and transitive repositories. -->
+    <RepositoryReference Include="sdk" />
   </ItemGroup>
 
   <ItemGroup Condition="'$(DotNetBuildSourceOnly)' == 'true'">
@@ -22,36 +24,26 @@
     <RepositoryReference Include="source-build-reference-packages" />
   </ItemGroup>
 
-  <ItemGroup Condition="'$(DotNetBuildSourceOnly)' != 'true'">
-    <!-- Depends on NuGet packages from the sdk repo and transitive repositories. -->
-    <RepositoryReference Include="sdk" />
-  </ItemGroup>
-
   <Target Name="PrepareScenarioTestsInputs"
-          DependsOnTargets="DetermineSourceBuiltSdkVersion"
+          DependsOnTargets="DetermineSourceBuiltSdkVersion;DetermineSourceBuiltRuntimeVersion"
           BeforeTargets="RepoTest">
     <PropertyGroup>
-      <_CurrentDateTime>$([System.DateTime]::Now.ToString("yyyy-MM-dd_HH_mm_ss"))</_CurrentDateTime>
-      <_TestXmlOutputPath>$(ScenarioTestsResultsDir)$(_CurrentDateTime).xml</_TestXmlOutputPath>
-      <_ScenarioTestsAdditionalArgs>--xml $(_TestXmlOutputPath) --target-rid $(TargetRid) --portable-rid $(PortableRid) --no-cleanup --no-traits Category=MultiTFM</_ScenarioTestsAdditionalArgs>
-
-      <!-- It's necessary to explicitly define the path to the dotnet tool to prevent Arcade from attempting to derive it. Otherwise, it will run the dotnet
-           install script to get a new one. We must use the locally built SDK instead in order to support non-portable RIDs for source build. -->
-      <_DotNetTool>$(DotNetSdkExtractDir)$([System.IO.Path]::GetFileName('$(DotNetTool)'))</_DotNetTool>
+      <TestArgs>$(TestArgs) /p:TestSdkVersion=$(SourceBuiltSdkVersion)</TestArgs>
+      <TestArgs>$(TestArgs) /p:TestFxVersion=$(SourceBuiltRuntimeVersion)</TestArgs>
     </PropertyGroup>
 
-    <MakeDir Directories="$(ScenarioTestsResultsDir)" />
+    <PropertyGroup>
+      <ScenarioTestsResultsDir>$([MSBuild]::NormalizeDirectory('$(ArtifactsTestResultsDir)', 'scenario-tests'))</ScenarioTestsResultsDir>
+      <TestXmlOutputPath>$(ScenarioTestsResultsDir)$([System.DateTime]::Now.ToString("yyyy-MM-dd_HH_mm_ss")).xml</TestXmlOutputPath>
+      <ScenarioTestsAdditionalArgs>--xml $(TestXmlOutputPath) --target-rid $(TargetRid) --portable-rid $(PortableRid) --no-cleanup --no-traits Category=MultiTFM</ScenarioTestsAdditionalArgs>
+    </PropertyGroup>
 
+    <!-- Needs to be set as an env var as the eng/common/tools parser can't handle this string. -->
     <ItemGroup>
-      <TestEnvironmentVariable Include="
-        DotNetRoot=$(DotNetSdkExtractDir);
-        TestSdkVersion=$(SourceBuiltSdkVersion);
-        AdditionalTestArgs=$(_ScenarioTestsAdditionalArgs);
-        DotNetTool=$(_DotNetTool);
-        _InitializeDotNetCli=$(DotNetSdkExtractDir.TrimEnd('/\'))" />
-      <!-- Needed for miscellanous projects in various repos - see https://github.com/dotnet/source-build/issues/4081-->
-      <TestEnvironmentVariable Include="RestoreConfigFile=$(NuGetConfigFile)" Condition="'$(NuGetConfigFile)' != '' and '$(DotNetBuildSourceOnly)' != 'true'" />
+      <TestEnvironmentVariable Include="AdditionalTestArgs=$(ScenarioTestsAdditionalArgs)" />
     </ItemGroup>
+
+    <MakeDir Directories="$(ScenarioTestsResultsDir)" />
   </Target>
 
   <Target Name="SetAzureDevOpsVariableForScenarioTests"
diff --git a/src/SourceBuild/content/repo-projects/sdk.proj b/src/SourceBuild/content/repo-projects/sdk.proj
index cb35ff50c040..ba40cd0e75b8 100644
--- a/src/SourceBuild/content/repo-projects/sdk.proj
+++ b/src/SourceBuild/content/repo-projects/sdk.proj
@@ -25,7 +25,6 @@
     <BuildArgs>$(BuildArgs) /p:PortableOSName=$(__PortableTargetOS)</BuildArgs>
     <BuildArgs>$(BuildArgs) /p:Rid=$(TargetRid)</BuildArgs>
     <BuildArgs>$(BuildArgs) /p:Architecture=$(TargetArchitecture)</BuildArgs>
-    <BuildArgs>$(BuildArgs) /p:DOTNET_INSTALL_DIR=$(DotNetRoot)</BuildArgs>
 
     <BuildArgs Condition="'$(TargetOS)' != 'windows'">$(BuildArgs) /p:AspNetCoreInstallerRid=$(TargetRid)</BuildArgs>
     <!-- sdk always wants to build portable on FreeBSD etc. -->