diff --git a/build/AzureIntegration.targets b/build/AzureIntegration.targets
deleted file mode 100644
index 8df9536eb73c..000000000000
--- a/build/AzureIntegration.targets
+++ /dev/null
@@ -1,30 +0,0 @@
-<Project>
-  <PropertyGroup>
-    <AzureIntegrationProjectRoot>$(MSBuildThisFileDirectory)..\modules\AzureIntegration\</AzureIntegrationProjectRoot>
-  </PropertyGroup>
-
-  <Target Name="BuildAzureIntegration" DependsOnTargets="PrepareOutputPaths;GeneratePropsFiles">
-    <PropertyGroup>
-      <AzureIntegrationProjProperties>
-        AspNetUniverseBuildOffline=true;
-        RepositoryRoot=$(AzureIntegrationProjectRoot);
-        DotNetRestoreSourcePropsPath=$(GeneratedRestoreSourcesPropsPath);
-        DotNetPackageVersionPropsPath=$(GeneratedPackageVersionPropsPath);
-        BuildNumber=$(BuildNumber);
-        Configuration=$(Configuration);
-        IsFinalBuild=$(IsFinalBuild);
-      </AzureIntegrationProjProperties>
-    </PropertyGroup>
-
-    <MSBuild Projects="$(MSBuildProjectFullPath)"
-             Targets="$(AzureIntegrationProjectTargets)"
-             Properties="$(AzureIntegrationProjProperties)" />
-
-    <ItemGroup>
-      <AzureIntegrationArtifacts Include="$(AzureIntegrationProjectRoot)artifacts\build\*" />
-    </ItemGroup>
-
-    <Copy SourceFiles="@(AzureIntegrationArtifacts)" DestinationFolder="$(BuildDir)" />
-  </Target>
-
-</Project>
diff --git a/build/SharedFx.targets b/build/SharedFx.targets
index 828b62606e80..8c0617bb9e0b 100644
--- a/build/SharedFx.targets
+++ b/build/SharedFx.targets
@@ -43,6 +43,7 @@
       <CommonProps>$(CommonProps);AspNetUniverseBuildOffline=true</CommonProps>
       <CommonProps>$(CommonProps);RuntimeFrameworkVersion=$(MicrosoftNETCoreApp21PackageVersion)</CommonProps>
       <CommonProps>$(CommonProps);AppMetapackageVersion=$(PackageVersion)</CommonProps>
+      <CommonProps>$(CommonProps);BuildNumber=$(BuildNumber)</CommonProps>
     </PropertyGroup>
 
     <Error
@@ -99,6 +100,28 @@
       BuildInParallel="false" />
   </Target>
 
+  <Target Name="BuildSiteExtension" DependsOnTargets="BuildMetapackages" Condition="'$(BuildSiteExtension)' == 'true'" >
+    <PropertyGroup>
+      <AzureIntegrationProjProperties>
+        AspNetUniverseBuildOffline=true;
+        DotNetRestoreSourcePropsPath=$(GeneratedRestoreSourcesPropsPath);
+        DotNetPackageVersionPropsPath=$(GeneratedPackageVersionPropsPath);
+        BuildNumber=$(BuildNumber);
+        Configuration=$(Configuration);
+        IsFinalBuild=$(IsFinalBuild);
+      </AzureIntegrationProjProperties>
+    </PropertyGroup>
+
+    <!-- Pack logging site extension -->
+    <MSBuild Projects="$(RepositoryRoot)\src\SiteExtensions\LoggingBranch\LoggingBranch.csproj" Targets="Restore;Pack" Properties="$(AzureIntegrationProjProperties);PackageOutputPath=$(BuildDir)" />
+  </Target>
+
+  <Target Name="GetSiteExtensionArtifactInfo" Condition="'$(BuildSiteExtension)' == 'true'" >
+    <MSBuild Projects="$(RepositoryRoot)\src\SiteExtensions\LoggingBranch\LoggingBranch.csproj" Targets="GetArtifactInfo" Properties="PackageOutputPath=$(BuildDir);BuildNumber=$(BuildNumber);DesignTimeBuild=true;IsFinalBuild=$(IsFinalBuild)">
+      <Output TaskParameter="TargetOutputs" ItemName="ArtifactInfo" />
+    </MSBuild>
+  </Target>
+
   <Target Name="DefineSharedFxPrerequisites" DependsOnTargets="ResolveCommitHash">
     <PropertyGroup>
       <RIDIsAcceptable Condition="'%(AllSharedFxRIDs.Identity)' == '$(SharedFxRID)'">true</RIDIsAcceptable>
diff --git a/build/artifacts.props b/build/artifacts.props
index 05028ca8bb7f..cc9b15aab972 100644
--- a/build/artifacts.props
+++ b/build/artifacts.props
@@ -43,6 +43,7 @@
     <PackageArtifact Include="Microsoft.AspNetCore.Authentication" AllMetapackage="true" AppMetapackage="true" Category="ship" />
     <PackageArtifact Include="Microsoft.AspNetCore.Authorization.Policy" AllMetapackage="true" AppMetapackage="true" Category="ship" />
     <PackageArtifact Include="Microsoft.AspNetCore.Authorization" AllMetapackage="true" AppMetapackage="true" Category="ship" />
+    <PackageArtifact Include="Microsoft.AspNetCore.AzureAppServices.SiteExtension.2.1" AllMetapackage="false" Category="noship" Condition="'$(BuildSiteExtension)' == 'true'" />
     <PackageArtifact Include="Microsoft.AspNetCore.AzureAppServices.HostingStartup" AllMetapackage="true" Category="ship" />
     <PackageArtifact Include="Microsoft.AspNetCore.AzureAppServicesIntegration" AllMetapackage="true" Category="ship" />
     <PackageArtifact Include="Microsoft.AspNetCore.Connections.Abstractions" AllMetapackage="true" AppMetapackage="true" Category="ship" />
diff --git a/build/repo.props b/build/repo.props
index 96da90068fad..8bb371f522e0 100644
--- a/build/repo.props
+++ b/build/repo.props
@@ -14,6 +14,9 @@
     <DependencyPackageDir>$(RepositoryRoot).deps\build\</DependencyPackageDir>
     <SignedDependencyPackageDir>$(RepositoryRoot).deps\Signed\Packages\</SignedDependencyPackageDir>
     <SharedSourcesFolder>$(RepositoryRoot)src\Shared\</SharedSourcesFolder>
+    <SharedFxArchitecture Condition="'$(SharedFxArchitecture)' == ''">$(SharedFxRid.Substring($([MSBuild]::Add($(SharedFxRid.LastIndexOf('-')), 1))))</SharedFxArchitecture>
+    <BuildSiteExtension>false</BuildSiteExtension>
+    <BuildSiteExtension Condition="'$(BuildSiteExtension)' == 'true' AND '$(OS)' != 'Windows_NT'">false</BuildSiteExtension>
   </PropertyGroup>
 
   <ItemGroup>
diff --git a/build/repo.targets b/build/repo.targets
index 59785014b5b4..ffb6530bd11e 100644
--- a/build/repo.targets
+++ b/build/repo.targets
@@ -1,7 +1,6 @@
 <Project>
   <Import Project="RepositoryBuild.targets" />
   <Import Project="PackageArchive.targets" />
-  <Import Project="AzureIntegration.targets" />
   <Import Project="SharedFx.targets" />
   <Import Project="SharedFxInstaller.targets" />
   <Import Project="Publish.targets" />
@@ -19,7 +18,7 @@
     <CompileDependsOn>$(CompileDependsOn);BuildProjects;PackSharedSources</CompileDependsOn>
     <CompileDependsOn Condition="'$(_ProjectsOnly)' != 'true'">$(CompileDependsOn);PackProjects;BuildRepositories</CompileDependsOn>
     <PackageDependsOn Condition=" '$(_ProjectsOnly)' == 'true'">$(PackageDependsOn);PackProjects</PackageDependsOn>
-    <PackageDependsOn Condition="'$(TestOnly)' != 'true' AND '$(_ProjectsOnly)' != 'true'">$(PackageDependsOn);BuildMetapackages;CheckExpectedPackagesExist</PackageDependsOn>
+    <PackageDependsOn Condition="'$(TestOnly)' != 'true' AND '$(_ProjectsOnly)' != 'true'">$(PackageDependsOn);BuildMetapackages;BuildSiteExtension;CheckExpectedPackagesExist</PackageDependsOn>
     <TestDependsOn>$(TestDependsOn);TestProjects</TestDependsOn>
     <TestDependsOn Condition="'$(_ProjectsOnly)' != 'true'">$(TestDependsOn);_TestRepositories</TestDependsOn>
     <GetArtifactInfoDependsOn>$(GetArtifactInfoDependsOn);GetProjectArtifactInfo</GetArtifactInfoDependsOn>
@@ -84,7 +83,7 @@
     </ItemGroup>
   </Target>
 
-  <Target Name="ResolveRepoInfo" DependsOnTargets="_ResolveProjectArtifactsInfoShipped;_PrepareRepositories;GetMetapackageArtifactInfo">
+  <Target Name="ResolveRepoInfo" DependsOnTargets="_ResolveProjectArtifactsInfoShipped;_PrepareRepositories;GetMetapackageArtifactInfo;GetSiteExtensionArtifactInfo">
     <!-- We need to pass the NETCoreApp package versions to msbuild so that it doesn't complain about us using a different one than it was restored against.  -->
     <PropertyGroup>
       <DesignTimeBuildProps>MicrosoftNETCoreAppPackageVersion=$(MicrosoftNETCoreAppPackageVersion);</DesignTimeBuildProps>
diff --git a/src/SiteExtensions/LoggingBranch/Directory.Build.targets b/src/SiteExtensions/LoggingBranch/Directory.Build.targets
new file mode 100644
index 000000000000..df33ae31f1f8
--- /dev/null
+++ b/src/SiteExtensions/LoggingBranch/Directory.Build.targets
@@ -0,0 +1,33 @@
+<Project>
+
+  <Import Project="$([MSBuild]::GetDirectoryNameOfFileAbove($(MSBuildThisFileDirectory)..\, Directory.Build.targets))\Directory.Build.targets" />
+
+  <Import Project="..\Sdk\SiteExtension.targets" />
+
+  <PropertyGroup>
+    <!-- There is no build output -->
+    <IncludeBuildOutput>false</IncludeBuildOutput>
+    <!-- There are no symbols. -->
+    <IncludeSymbols>false</IncludeSymbols>
+    <!-- There is no API to check -->
+    <EnableApiCheck>false</EnableApiCheck>
+    <!-- Manually control dependencies -->
+    <DisableImplicitFrameworkReferences>true</DisableImplicitFrameworkReferences>
+    <!-- There is no documentation  -->
+    <GenerateDocumentationFile>false</GenerateDocumentationFile>
+    <!-- There is no documentation  -->
+    <RunPackageAnalysis>false</RunPackageAnalysis>
+    <GenerateAssemblyInfo>false</GenerateAssemblyInfo>
+  </PropertyGroup>
+
+  <Target Name="GetArtifactInfo" Returns="@(ArtifactInfo)">
+    <ItemGroup>
+      <ArtifactInfo Include="$(TargetPath)">
+        <ArtifactType>NuGetPackage</ArtifactType>
+        <PackageId>$(PackageId)</PackageId>
+        <Version>$(PackageVersion)</Version>
+      </ArtifactInfo>
+    </ItemGroup>
+  </Target>
+
+</Project>
diff --git a/src/SiteExtensions/LoggingBranch/LoggingBranch.csproj b/src/SiteExtensions/LoggingBranch/LoggingBranch.csproj
new file mode 100644
index 000000000000..0fae8e658a95
--- /dev/null
+++ b/src/SiteExtensions/LoggingBranch/LoggingBranch.csproj
@@ -0,0 +1,33 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TrimmedVersion>$(AspNetCoreMajorVersion).$(AspNetCoreMinorVersion)</TrimmedVersion>
+    <title>ASP.NET Core Extensions</title>
+    <Description>This extension enables additional functionality for ASP.NET Core on Azure WebSites, such as enabling Azure logging.</Description>
+    <TargetFramework>net461</TargetFramework>
+    <GenerateDocumentationFile>false</GenerateDocumentationFile>
+    <PackageTags>aspnet;logging;aspnetcore;AzureSiteExtension;keyvault;configuration;dataprotection</PackageTags>
+    <ContentTargetFolders>content</ContentTargetFolders>
+    <PackageId>Microsoft.AspNetCore.AzureAppServices.SiteExtension.$(TrimmedVersion)</PackageId>
+    <MicrosoftAspNetCoreAppPackageVersion>$(PackageVersion)</MicrosoftAspNetCoreAppPackageVersion>
+    <HostingStartupRuntimeFrameworkVersion>$(MicrosoftNETCoreApp21PackageVersion)</HostingStartupRuntimeFrameworkVersion>
+    <TargetFramework>net461</TargetFramework>
+    <GenerateDocumentationFile>false</GenerateDocumentationFile>
+    <PackageType>AzureSiteExtension</PackageType>
+    <NoPackageAnalysis>true</NoPackageAnalysis>
+    <IncludeBuildOutput>false</IncludeBuildOutput>
+    <IncludeSymbols>false</IncludeSymbols>
+    <IncludeSource>false</IncludeSource>
+    <ContentTargetFolders>content</ContentTargetFolders>
+    <IsPackageInThisPatch>true</IsPackageInThisPatch>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <HostingStartupRuntimeStoreTargets Include="netcoreapp2.1" Runtime="win7-x64" />
+    <HostingStartupRuntimeStoreTargets Include="netcoreapp2.1" Runtime="win7-x86" />
+    <HostingStartupPackageReference Include="Microsoft.AspNetCore.AzureAppServices.HostingStartup" Version="$(PackageVersion)" />
+
+    <PackageReference Include="Internal.AspNetCore.Sdk" PrivateAssets="All" Version="$(InternalAspNetCoreSdkPackageVersion)" />
+  </ItemGroup>
+
+</Project>
diff --git a/src/SiteExtensions/Sdk/HostingStartup/HostingStartup.csproj b/src/SiteExtensions/Sdk/HostingStartup/HostingStartup.csproj
new file mode 100644
index 000000000000..59cdf76e60a6
--- /dev/null
+++ b/src/SiteExtensions/Sdk/HostingStartup/HostingStartup.csproj
@@ -0,0 +1,13 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>netcoreapp2.1</TargetFramework>
+    <OutputType>Exe</OutputType>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Microsoft.AspNetCore.App" Version="$(MicrosoftAspNetCoreAppPackageVersion)" PrivateAssets="None" />
+    <PackageReference Include="$(HostingStartupPackageName)" Version="$(HostingStartupPackageVersion)" PrivateAssets="None" />
+  </ItemGroup>
+
+</Project>
diff --git a/src/SiteExtensions/Sdk/HostingStartup/Program.cs b/src/SiteExtensions/Sdk/HostingStartup/Program.cs
new file mode 100644
index 000000000000..8cd3c0026c0b
--- /dev/null
+++ b/src/SiteExtensions/Sdk/HostingStartup/Program.cs
@@ -0,0 +1,7 @@
+// Copyright (c) .NET Foundation and contributors. All rights reserved.
+// Licensed under the MIT license. See LICENSE file in the project root for full license information.
+
+public class Program
+{
+    public static void Main() { }
+}
\ No newline at end of file
diff --git a/src/SiteExtensions/Sdk/SiteExtension.targets b/src/SiteExtensions/Sdk/SiteExtension.targets
new file mode 100644
index 000000000000..6e941d74aca7
--- /dev/null
+++ b/src/SiteExtensions/Sdk/SiteExtension.targets
@@ -0,0 +1,86 @@
+<!--
+  This file is automatically imported by NuGet into a user's project
+  when it targets a single framework, or in classic (pre 2017) csproj projects.
+-->
+
+<Project>
+  <Target Name="GenerateHostingStartupDeps" Condition="'@(HostingStartupPackageReference->Count())' != '0'" BeforeTargets="_GetPackageFiles" >
+
+    <PropertyGroup>
+      <_TemplatesDirectory>$(MSBuildThisFileDirectory)..\content\</_TemplatesDirectory>
+      <_DepsOutputDirectory>$(RepositoryRoot).w\se\</_DepsOutputDirectory>
+      <_WorkingDirectory>$(_DepsOutputDirectory)\depswork</_WorkingDirectory>
+      <_BasePackagePath>content\additionaldeps\</_BasePackagePath>
+      <_RuntimeStoreManifestFile>$(_DepsOutputDirectory)\rs.csproj</_RuntimeStoreManifestFile>
+      <_RuntimeStoreOutput>$(_DepsOutputDirectory)\rs\</_RuntimeStoreOutput>
+      <ManifestFileContents>
+      <![CDATA[
+<Project Sdk="Microsoft.NET.Sdk">
+  <ItemGroup>
+    <PackageReference Remove="Internal.AspNetCore.Sdk" />
+    <PackageReference Include="Microsoft.AspNetCore.App" Version="$(MicrosoftAspNetCoreAppPackageVersion)" IsImplicitlyDefined="true"/>
+    <PackageReference Include="%(HostingStartupPackageReference.Identity)" Version="%(HostingStartupPackageReference.Version)" />
+  </ItemGroup>
+</Project>
+      ]]>
+      </ManifestFileContents>
+    </PropertyGroup>
+
+    <ItemGroup>
+      <_TemplateFiles Include="$(MSBuildThisFileDirectory)\HostingStartup\*.cs*" />
+      <_HostingStartupPackageReference
+        Include="%(HostingStartupPackageReference.Identity)"
+        Source="%(HostingStartupPackageReference.Source)"
+        Version="%(HostingStartupPackageReference.Version)"
+        WorkingDirectory="$(_DepsOutputDirectory)%(HostingStartupPackageReference.Identity)"
+        Project="$(_DepsOutputDirectory)%(HostingStartupPackageReference.Identity)\HostingStartup.csproj"
+        DepsFile="$(_DepsOutputDirectory)%(HostingStartupPackageReference.Identity)\p\HostingStartup.deps.json"
+        TrimmedDepsFile="$(_DepsOutputDirectory)%(HostingStartupPackageReference.Identity)\%(HostingStartupPackageReference.Identity).deps.json"
+        PackagePath="$(_BasePackagePath)%(HostingStartupPackageReference.Identity)\shared\Microsoft.AspNetCore.App\$(MicrosoftAspNetCoreAppPackageVersion)\"
+         />
+    </ItemGroup>
+    <MakeDir Directories="$(_DepsOutputDirectory)" />
+
+    <!-- Generate runtime store -->
+    <WriteLinesToFile File="$(_RuntimeStoreManifestFile)" Lines="$(ManifestFileContents)" Overwrite="true" Encoding="Unicode"/>
+
+    <PropertyGroup>
+      <_CommonProperties>
+        AspNetUniverseBuildOffline=true;
+        DotNetRestoreSourcePropsPath=$(DotNetRestoreSourcePropsPath);
+        DotNetPackageVersionPropsPath=$(DotNetPackageVersionPropsPath);
+        BuildNumber=$(BuildNumber);
+        Configuration=$(Configuration);
+        IsFinalBuild=$(IsFinalBuild);
+        MicrosoftAspNetCoreAppPackageVersion=$(MicrosoftAspNetCoreAppPackageVersion);
+        RuntimeFrameworkVersion=$(HostingStartupRuntimeFrameworkVersion);
+      </_CommonProperties>
+    </PropertyGroup>
+
+    <MSBuild Projects="$(_RuntimeStoreManifestFile)"
+             Targets="ComposeStore"
+             Properties="TargetFramework=%(HostingStartupRuntimeStoreTargets.Identity);RuntimeIdentifier=%(HostingStartupRuntimeStoreTargets.Runtime);ComposeDir=$(_RuntimeStoreOutput)\%(HostingStartupRuntimeStoreTargets.Runtime);SkipOptimization=true;$(_CommonProperties)" />
+    <!-- Generate deps -->
+    <RemoveDir Directories="%(_HostingStartupPackageReference.WorkingDirectory)" />
+
+    <Copy SourceFiles="@(_TemplateFiles)" DestinationFolder="%(_HostingStartupPackageReference.WorkingDirectory)" />
+
+    <MSBuild Projects="%(_HostingStartupPackageReference.Project)"
+             Targets="Restore"
+             Properties="HostingStartupPackageName=%(_HostingStartupPackageReference.Identity);HostingStartupPackageVersion=%(_HostingStartupPackageReference.Version);UseAppHost=false;NoBuild=false;$(_CommonProperties)" />
+
+    <MSBuild Projects="%(_HostingStartupPackageReference.Project)"
+             Targets="Publish"
+             Properties="PublishDir=%(_HostingStartupPackageReference.WorkingDirectory)\p;HostingStartupPackageName=%(_HostingStartupPackageReference.Identity);HostingStartupPackageVersion=%(_HostingStartupPackageReference.Version);UseAppHost=false;NoBuild=false;IncludeMainProjectInDepsFile=false;$(_CommonProperties)" />
+    <Copy SourceFiles="%(_HostingStartupPackageReference.DepsFile)" DestinationFiles="%(_HostingStartupPackageReference.TrimmedDepsFile)" />
+
+    <ItemGroup>
+      <_RuntimeStoreFiles Include="$(_RuntimeStoreOutput)\%(HostingStartupRuntimeStoreTargets.Runtime)\**\*.dll" />
+
+      <Content Include="%(_RuntimeStoreFiles.Identity)" PackagePath="content\store\%(RecursiveDir)" />
+      <Content Include="%(_HostingStartupPackageReference.TrimmedDepsFile)" PackagePath="%(_HostingStartupPackageReference.PackagePath)" />
+    </ItemGroup>
+
+  </Target>
+
+</Project>
diff --git a/version.props b/version.props
index 08bb4a8c92c2..17e25d588950 100644
--- a/version.props
+++ b/version.props
@@ -5,7 +5,7 @@
     <AspNetCorePatchVersion>7</AspNetCorePatchVersion>
     <PreReleaseLabel>servicing</PreReleaseLabel>
     <PreReleaseBrandingLabel>Servicing</PreReleaseBrandingLabel>
-    <BuildNumber Condition="'$(BuildNumber)' == ''">t000</BuildNumber>
+    <BuildNumber Condition="'$(BuildNumber)' == '' OR '$(UsingLocalBuildNumber)' == 'true'">t000</BuildNumber>
     <VersionPrefix>$(AspNetCoreMajorVersion).$(AspNetCoreMinorVersion).$(AspNetCorePatchVersion)</VersionPrefix>
     <ExperimentalVersionPrefix>0.1.$(AspNetCorePatchVersion)</ExperimentalVersionPrefix>