diff --git a/eng/Versions.props b/eng/Versions.props
index 4c7d427f88e0..faca990688d0 100644
--- a/eng/Versions.props
+++ b/eng/Versions.props
@@ -17,7 +17,31 @@
     <NETCoreAppMaximumVersion>$(MajorVersion).$(MinorVersion)</NETCoreAppMaximumVersion>
     <NETCoreAppFrameworkVersion>$(MajorVersion).$(MinorVersion)</NETCoreAppFrameworkVersion>
     <NETCoreAppFramework>netcoreapp$(NETCoreAppFrameworkVersion)</NETCoreAppFramework>
+    <!--
+      The NETStandard.Library targeting pack does not version along with the runtime. Advance this
+      version if a new NETStandard targeting pack was released in the previous servicing release.
+    -->
+    <NETStandardPatchVersion>1</NETStandardPatchVersion>
   </PropertyGroup>
+  <!--
+    Servicing build settings.
+
+    * To enable a package build for the current patch release, set PatchVersion to match the current
+      patch version of that package. (major.minor.patch)
+
+    * Do not delete these lines to disable the package build. When PatchVersion is incremented at
+      the beginning of the next servicing release, the package automatically stops building because
+      the version no longer matches.
+
+    * These items also keep track of the last time each package was patched, enabling source-build
+      to produce the correct old version number using current sources.
+  -->
+  <ItemGroup Condition="'$(StabilizePackageVersion)' == 'true'">
+    <ProjectServicingConfiguration Include="Microsoft.NETCore.App.Ref" PatchVersion="0" />
+    <ProjectServicingConfiguration Include="Microsoft.WindowsDesktop.App.Ref" PatchVersion="0" />
+    <ProjectServicingConfiguration Include="NETStandard.Library.Ref" PatchVersion="0" />
+  </ItemGroup>
+
   <PropertyGroup>
     <MicrosoftDotNetMaestroTasksVersion>1.0.0-beta.18619.4</MicrosoftDotNetMaestroTasksVersion>
   </PropertyGroup>
diff --git a/src/pkg/packaging-tools/framework.packaging.targets b/src/pkg/packaging-tools/framework.packaging.targets
index 1ef58a75a574..62b684ad56d9 100644
--- a/src/pkg/packaging-tools/framework.packaging.targets
+++ b/src/pkg/packaging-tools/framework.packaging.targets
@@ -35,6 +35,17 @@
     </PropertyGroup>
   </Target>
 
+  <Target Name="SkipBuildInstallerProperties"
+          DependsOnTargets="GetSkipBuildProps"
+          BeforeTargets="GetInstallerGenerationFlags">
+    <PropertyGroup Condition="'$(SkipBuild)' == 'true'">
+      <GenerateDeb>false</GenerateDeb>
+      <GenerateRpm>false</GenerateRpm>
+      <GeneratePkg>false</GeneratePkg>
+      <GenerateMSI>false</GenerateMSI>
+    </PropertyGroup>
+  </Target>
+
   <!--
     This targets file is imported for all pkgproj files, but some (like DotNetHostPolicy) don't need
     installers and just use the normal packaging tooling.
diff --git a/src/pkg/packaging-tools/packaging-tools.targets b/src/pkg/packaging-tools/packaging-tools.targets
index af1393f61ee5..667536eb303d 100644
--- a/src/pkg/packaging-tools/packaging-tools.targets
+++ b/src/pkg/packaging-tools/packaging-tools.targets
@@ -96,7 +96,54 @@
     </PropertyGroup>
   </Target>
 
-  <Target Name="GetSkipBuildProps">
+  <Target Name="GetCurrentProjectServicingConfiguration">
+    <ItemGroup>
+      <CurrentProjectServicingConfiguration
+        Include="@(ProjectServicingConfiguration)"
+        Condition="'%(Identity)' == '$(MSBuildProjectName)'" />
+    </ItemGroup>
+  </Target>
+
+  <!--
+    The Microsoft build's per-package servicing policy conflicts with the source-build restrictions.
+    Targeting packs, for example, are only built/published when there's a known change to release.
+    This is in contrast to runtime packs and the shared framework, which are always built and
+    published. This means it's common in the Microsoft build for downstream repos to depend on two
+    builds' outputs: the current build's runtime assets, and some old build's targeting pack.
+
+    The Microsoft build can simply download the old targeting pack from NuGet.org. Source-build
+    can't do this because the bits on NuGet.org are not built locally. Instead, source-build assumes
+    it's possible to use current sources to build a package with the old version. This target
+    applies the old build's patch version to make that happen.
+
+    This solution has pitfalls. More info at https://github.com/dotnet/core-setup/issues/8735. The
+    target supports SkipSetLastReleasedVersionForSourceBuild (unused as of writing) to allow
+    disabling this workaround if a better way forward is implemented.
+  -->
+  <Target Name="SetLastReleasedVersionForSourceBuild"
+          Condition="
+            '$(DotNetBuildFromSource)' == 'true' and
+            '$(SkipSetLastReleasedVersionForSourceBuild)' != 'true'"
+          BeforeTargets="GetProductVersions"
+          DependsOnTargets="GetCurrentProjectServicingConfiguration">
+    <PropertyGroup>
+      <MostRecentProducedServicingPatchVersion>%(CurrentProjectServicingConfiguration.PatchVersion)</MostRecentProducedServicingPatchVersion>
+      <PatchVersion Condition="'$(MostRecentProducedServicingPatchVersion)' != ''">$(MostRecentProducedServicingPatchVersion)</PatchVersion>
+    </PropertyGroup>
+  </Target>
+
+  <Target Name="GetSkipBuildProps"
+          DependsOnTargets="
+            GetCurrentProjectServicingConfiguration;
+            GetProductVersions">
+    <!--
+      Skip the build if there is an applicable servicing configuration, and the servicing
+      configuration indicates this project shouldn't build for this patch version.
+    -->
+    <PropertyGroup Condition="'@(CurrentProjectServicingConfiguration)' != ''">
+      <SkipBuild Condition="'%(CurrentProjectServicingConfiguration.PatchVersion)' != '$(PatchVersion)'">true</SkipBuild>
+    </PropertyGroup>
+
     <PropertyGroup>
       <!-- Avoid building a project when none of the possible BuildRIDs is the current RID. -->
       <_packageRIDInBuildRIDList Condition="'%(BuildRID.Identity)' == '$(PackageRID)'">true</_packageRIDInBuildRIDList>
diff --git a/src/pkg/projects/netstandard/pkg/Directory.Build.props b/src/pkg/projects/netstandard/pkg/Directory.Build.props
index 5f001b51e7e8..f913a01c9476 100644
--- a/src/pkg/projects/netstandard/pkg/Directory.Build.props
+++ b/src/pkg/projects/netstandard/pkg/Directory.Build.props
@@ -3,14 +3,14 @@
     <IsFrameworkPackage>true</IsFrameworkPackage>
     <ShortFrameworkName>netstandard</ShortFrameworkName>
     <ProductBrandPrefix>Microsoft .NET Standard</ProductBrandPrefix>
-
-    <ProductBandVersion>2.1</ProductBandVersion>
-    <ProductionVersion>$(ProductBandVersion).0</ProductionVersion>
   </PropertyGroup>
 
   <Import Project="$([MSBuild]::GetDirectoryNameOfFileAbove($(MSBuildThisFileDirectory).., Directory.Build.props))\Directory.Build.props" />
 
   <PropertyGroup>
+    <ProductBandVersion>2.1</ProductBandVersion>
+    <PatchVersion>$(NETStandardPatchVersion)</PatchVersion>
+
     <FrameworkListName>.NET Standard 2.1</FrameworkListName>
     <FrameworkListTargetFrameworkIdentifier>.NETStandard</FrameworkListTargetFrameworkIdentifier>
     <FrameworkListTargetFrameworkVersion>2.1</FrameworkListTargetFrameworkVersion>
diff --git a/src/test/Microsoft.DotNet.CoreSetup.Packaging.Tests/NETCoreTests.cs b/src/test/Microsoft.DotNet.CoreSetup.Packaging.Tests/NETCoreTests.cs
index dcd8539f5b73..244db204b19a 100644
--- a/src/test/Microsoft.DotNet.CoreSetup.Packaging.Tests/NETCoreTests.cs
+++ b/src/test/Microsoft.DotNet.CoreSetup.Packaging.Tests/NETCoreTests.cs
@@ -14,10 +14,16 @@ public class NETCoreTests
         [Fact]
         public void NETCoreTargetingPackIsValid()
         {
-            using (var tester = NuGetArtifactTester.Open(
+            using (var tester = NuGetArtifactTester.OpenOrNull(
                 dirs,
                 "Microsoft.NETCore.App.Ref"))
             {
+                // Allow no targeting pack for servicing builds.
+                if (tester == null)
+                {
+                    return;
+                }
+
                 tester.IsTargetingPackForPlatform();
                 tester.HasOnlyTheseDataFiles(
                     "data/FrameworkList.xml",
diff --git a/src/test/Microsoft.DotNet.CoreSetup.Packaging.Tests/NETStandardTests.cs b/src/test/Microsoft.DotNet.CoreSetup.Packaging.Tests/NETStandardTests.cs
index 893a4c4342a5..8dc9e9d5eed2 100644
--- a/src/test/Microsoft.DotNet.CoreSetup.Packaging.Tests/NETStandardTests.cs
+++ b/src/test/Microsoft.DotNet.CoreSetup.Packaging.Tests/NETStandardTests.cs
@@ -14,10 +14,16 @@ public class NETStandardTests
         [Fact]
         public void NETStandardTargetingPackIsValid()
         {
-            using (var tester = NuGetArtifactTester.Open(
+            using (var tester = NuGetArtifactTester.OpenOrNull(
                 dirs,
                 "NETStandard.Library.Ref"))
             {
+                // Allow no targeting pack for servicing builds.
+                if (tester == null)
+                {
+                    return;
+                }
+
                 tester.HasOnlyTheseDataFiles(
                     "data/FrameworkList.xml",
                     "data/PackageOverrides.txt");
diff --git a/src/test/Microsoft.DotNet.CoreSetup.Packaging.Tests/WindowsDesktopTests.cs b/src/test/Microsoft.DotNet.CoreSetup.Packaging.Tests/WindowsDesktopTests.cs
index 437739950073..e443a8720d20 100644
--- a/src/test/Microsoft.DotNet.CoreSetup.Packaging.Tests/WindowsDesktopTests.cs
+++ b/src/test/Microsoft.DotNet.CoreSetup.Packaging.Tests/WindowsDesktopTests.cs
@@ -25,7 +25,11 @@ public void WindowsDesktopTargetingPackIsValid()
             {
                 if (CurrentRidShouldCreateNupkg)
                 {
-                    Assert.NotNull(tester);
+                    // Allow no targeting pack for servicing builds.
+                    if (tester == null)
+                    {
+                        return;
+                    }
 
                     tester.IsTargetingPackForPlatform();
                     tester.HasOnlyTheseDataFiles(