diff --git a/Directory.Build.props b/Directory.Build.props
index 721f099a7734..9979b084ffc2 100644
--- a/Directory.Build.props
+++ b/Directory.Build.props
@@ -173,6 +173,8 @@
       freebsd-x64
     </SupportedRuntimeIdentifiers>
 
+    <SupportedRuntimeIdentifiers Condition=" '$(PortableBuild)' == 'false' ">$(SupportedRuntimeIdentifiers);$(TargetRuntimeIdentifier)</SupportedRuntimeIdentifiers>
+
     <!-- Make error messages clickable in VS Code's console -->
     <GenerateFullPaths Condition="'$(VSCODE_CWD)' != '' OR '$(TERM_PROGRAM)' == 'vscode'">true</GenerateFullPaths>
 
diff --git a/eng/Common.props b/eng/Common.props
index a9a69bde9f22..3dcca1c6b54d 100644
--- a/eng/Common.props
+++ b/eng/Common.props
@@ -6,6 +6,8 @@
     <TargetOsName Condition=" '$(TargetOsName)' == '' AND $([MSBuild]::IsOSPlatform('FreeBSD'))">freebsd</TargetOsName>
     <TargetArchitecture Condition="'$(TargetArchitecture)' == ''">x64</TargetArchitecture>
     <TargetRuntimeIdentifier Condition="'$(TargetRuntimeIdentifier)' == ''">$(TargetOsName)-$(TargetArchitecture)</TargetRuntimeIdentifier>
+    <PortableBuild Condition="'$(PortableBuild)' == ''">true</PortableBuild>
+    <DefaultAppHostRuntimeIdentifier Condition=" '$(PortableBuild)' == 'false' ">$(TargetRuntimeIdentifier)</DefaultAppHostRuntimeIdentifier>
   </PropertyGroup>
 
   <PropertyGroup Condition=" '$(BuildAllProjects)' == 'true' ">
diff --git a/eng/Dependencies.props b/eng/Dependencies.props
index 75c41177ffa6..d39473508c3b 100644
--- a/eng/Dependencies.props
+++ b/eng/Dependencies.props
@@ -95,6 +95,7 @@ and are generated based on the last package release.
     <LatestPackageReference Include="Microsoft.NETCore.App.Runtime.linux-musl-x64" />
     <LatestPackageReference Include="Microsoft.NETCore.App.Runtime.linux-musl-arm" />
     <LatestPackageReference Include="Microsoft.NETCore.App.Runtime.linux-musl-arm64" />
+    <LatestPackageReference Include="Microsoft.NETCore.App.Runtime.$(TargetRuntimeIdentifier)" Condition=" '$(PortableBuild)' == 'false' " />
 
     <!-- Crossgen2 compiler -->
     <LatestPackageReference Include="Microsoft.NETCore.App.Crossgen2.osx-x64" />
@@ -109,6 +110,7 @@ and are generated based on the last package release.
     <LatestPackageReference Include="Microsoft.NETCore.App.Crossgen2.win-x86" />
     <LatestPackageReference Include="Microsoft.NETCore.App.Crossgen2.win-arm" />
     <LatestPackageReference Include="Microsoft.NETCore.App.Crossgen2.win-arm64" />
+    <LatestPackageReference Include="Microsoft.NETCore.App.Crossgen2.$(TargetRuntimeIdentifier)" Condition=" '$(PortableBuild)' == 'false' " />
   </ItemGroup>
 
   <ItemGroup Label=".NET team dependencies (Non-source-build)" Condition="'$(DotNetBuildFromSource)' != 'true'">
diff --git a/eng/tools/GenerateFiles/Directory.Build.targets.in b/eng/tools/GenerateFiles/Directory.Build.targets.in
index c5206ec8c611..5e693b6d7cc9 100644
--- a/eng/tools/GenerateFiles/Directory.Build.targets.in
+++ b/eng/tools/GenerateFiles/Directory.Build.targets.in
@@ -39,8 +39,15 @@
       <DefaultRuntimeFrameworkVersion Condition=" '$(IsServicingBuild)' != 'true' AND
           '%(TargetFramework)' == '${DefaultNetCoreTargetFramework}' AND
           '$(TargetLatestDotNetRuntime)' != 'false' ">${MicrosoftNETCoreAppRuntimeVersion}</DefaultRuntimeFrameworkVersion>
+       <RuntimePackRuntimeIdentifiers Condition=" '$(PortableBuild)' == 'false' ">$(TargetRuntimeIdentifier)</RuntimePackRuntimeIdentifiers>
     </KnownFrameworkReference>
 
+    <KnownCrossgen2Pack Update="Microsoft.NETCore.App.Crossgen2" Condition=" '$(PortableBuild)' == 'false' ">
+      <Crossgen2PackVersion
+          Condition=" '%(TargetFramework)' == '${DefaultNetCoreTargetFramework}' ">${MicrosoftNETCoreAppRuntimeVersion}</Crossgen2PackVersion>
+      <Crossgen2RuntimeIdentifiers>$(TargetRuntimeIdentifier)</Crossgen2RuntimeIdentifiers>
+    </KnownCrossgen2Pack>
+
     <!-- Use the just-built ASP.NET Core shared framework if available except when building product code in servicing. -->
     <KnownFrameworkReference Update="Microsoft.AspNetCore.App" Condition=" $(UpdateAspNetCoreKnownFramework) ">
       <LatestRuntimeFrameworkVersion
diff --git a/src/Components/benchmarkapps/Wasm.Performance/Driver/Wasm.Performance.Driver.csproj b/src/Components/benchmarkapps/Wasm.Performance/Driver/Wasm.Performance.Driver.csproj
index 346ddc48f16b..9e35e9b1e75e 100644
--- a/src/Components/benchmarkapps/Wasm.Performance/Driver/Wasm.Performance.Driver.csproj
+++ b/src/Components/benchmarkapps/Wasm.Performance/Driver/Wasm.Performance.Driver.csproj
@@ -8,7 +8,7 @@
     <!-- WebDriver is not strong-named, so this test project cannot be strong named either. -->
     <SignAssembly>false</SignAssembly>
     <IsTestAssetProject>true</IsTestAssetProject>
-    <RuntimeIdentifier>linux-x64</RuntimeIdentifier>
+    <RuntimeIdentifier Condition=" '$(DotNetBuildFromSource)' != 'true' ">linux-x64</RuntimeIdentifier>
   </PropertyGroup>
 
   <ItemGroup>
diff --git a/src/Framework/App.Runtime/src/Microsoft.AspNetCore.App.Runtime.csproj b/src/Framework/App.Runtime/src/Microsoft.AspNetCore.App.Runtime.csproj
index aeb3c08f1382..a23f607e4921 100644
--- a/src/Framework/App.Runtime/src/Microsoft.AspNetCore.App.Runtime.csproj
+++ b/src/Framework/App.Runtime/src/Microsoft.AspNetCore.App.Runtime.csproj
@@ -96,7 +96,7 @@ This package is an internal implementation of the .NET Core SDK and is not meant
     <Crossgen2ToolFileName Condition=" '$(TargetOsName)' == 'win' ">$(Crossgen2ToolFileName).exe</Crossgen2ToolFileName>
 
     <!-- E.g. "PkgMicrosoft_NETCore_App_Runtime_win-x64" (set in obj/Microsoft.AspNetCore.App.Runtime.csproj.nuget.g.props). -->
-    <RuntimePackageRootVariableName>PkgMicrosoft_NETCore_App_Runtime_$(RuntimeIdentifier)</RuntimePackageRootVariableName>
+    <RuntimePackageRootVariableName>PkgMicrosoft_NETCore_App_Runtime_$(RuntimeIdentifier.Replace('.', '_'))</RuntimePackageRootVariableName>
 
     <!--
       Determine the crossgen2 package path property name. Special case linux-musl-arm and linux-musl-arm64 because they
@@ -105,9 +105,10 @@ This package is an internal implementation of the .NET Core SDK and is not meant
     -->
     <BuildOsName>$(TargetOsName)</BuildOsName>
     <BuildOsName Condition="'$(TargetOsName)' == 'linux-musl' and '$(TargetArchitecture)'!='x64'">linux</BuildOsName>
+    <BuildOsName Condition=" '$(PortableBuild)' == 'false' ">$(TargetRuntimeIdentifier.Substring(0,$(TargetRuntimeIdentifier.IndexOf('-'))))</BuildOsName>
     <Crossgen2BuildArchitecture Condition=" '$(BuildOsName)' == 'win' ">x64</Crossgen2BuildArchitecture>
     <Crossgen2BuildArchitecture Condition=" '$(Crossgen2BuildArchitecture)' == '' ">$(BuildArchitecture)</Crossgen2BuildArchitecture>
-    <Crossgen2PackageRootVariableName>PkgMicrosoft_NETCore_App_Crossgen2_$(BuildOsName)-$(Crossgen2BuildArchitecture)</Crossgen2PackageRootVariableName>
+    <Crossgen2PackageRootVariableName>PkgMicrosoft_NETCore_App_Crossgen2_$(BuildOsName.Replace('.', '_'))-$(Crossgen2BuildArchitecture)</Crossgen2PackageRootVariableName>
 
     <AssetTargetFallback>$(AssetTargetFallback);native,Version=0.0</AssetTargetFallback>
 
diff --git a/src/Tools/Directory.Build.targets b/src/Tools/Directory.Build.targets
index 854f90ab5c20..438ea3da045d 100644
--- a/src/Tools/Directory.Build.targets
+++ b/src/Tools/Directory.Build.targets
@@ -1,7 +1,7 @@
 <Project>
   <PropertyGroup Condition=" '$(PackAsTool)' == 'true' ">
     <!-- Microsoft tool packages are required to target both x64 and x86. -->
-    <PackAsToolShimRuntimeIdentifiers Condition=" '$(IsShippingPackage)' == 'true' ">win-x64;win-x86</PackAsToolShimRuntimeIdentifiers>
+    <PackAsToolShimRuntimeIdentifiers Condition=" '$(IsShippingPackage)' == 'true' AND '$(DotNetBuildFromSource)' != 'true' ">win-x64;win-x86</PackAsToolShimRuntimeIdentifiers>
     <!-- None of the tool projects are project reference providers. -->
     <IsProjectReferenceProvider>false</IsProjectReferenceProvider>
     <!--