diff --git a/Build.proj b/Build.proj
index baa240685ae..0957ae6846e 100644
--- a/Build.proj
+++ b/Build.proj
@@ -8,7 +8,7 @@
   </ItemGroup>
 
   <Import Project="$(RepositoryEngineeringDir)SubsetValidation.targets" />
-  <Import Project="$(RepositoryEngineeringDir)restore\optimizationData.targets" Condition="'$(DotNetBuildFromSource)' != 'true'" />
+  <Import Project="$(RepositoryEngineeringDir)restore\optimizationData.targets" Condition="'$(DotNetBuildSourceOnly)' != 'true'" />
 
   <Target Name="BuildLocalTasks"
           BeforeTargets="Build">
diff --git a/Directory.Build.props b/Directory.Build.props
index 0db4a1cc3d3..26e112fab56 100644
--- a/Directory.Build.props
+++ b/Directory.Build.props
@@ -5,12 +5,12 @@
     <ImportDirectoryBuildProps>false</ImportDirectoryBuildProps>
     <!-- Used to determine if we should build some packages only once across multiple official build legs.
          For offline builds we still set OfficialBuildId but we need to build all the packages for a single
-         leg only, so we also take DotNetBuildFromSource  into account. -->
-    <BuildingAnOfficialBuildLeg Condition="'$(BuildingAnOfficialBuildLeg)' == '' and '$(OfficialBuildId)' != '' and '$(DotNetBuildFromSource)' != 'true'">true</BuildingAnOfficialBuildLeg>
+         leg only, so we also take DotNetBuildSourceOnly into account. -->
+    <BuildingAnOfficialBuildLeg Condition="'$(BuildingAnOfficialBuildLeg)' == '' and '$(OfficialBuildId)' != '' and '$(DotNetBuildSourceOnly)' != 'true'">true</BuildingAnOfficialBuildLeg>
     <!-- When doing a source build, we want to build the various text-only manifests in
          all cases, rather than ordinarily where we build them during mobile or wasm
          build legs. This makes the manifests available on source-only builds. -->
-    <ForceBuildMobileManifests Condition="'$(DotNetBuildFromSource)' == 'true'">true</ForceBuildMobileManifests>
+    <ForceBuildMobileManifests Condition="'$(DotNetBuildSourceOnly)' == 'true'">true</ForceBuildMobileManifests>
   </PropertyGroup>
 
   <PropertyGroup Label="CalculateTargetOS">
@@ -94,7 +94,7 @@
 
     <!-- The minimum supported .NET version. -->
     <NetCoreAppMinimum>net8.0</NetCoreAppMinimum>
-    <NetCoreAppMinimum Condition="'$(DotNetBuildFromSource)' == 'true'">$(NetCoreAppCurrent)</NetCoreAppMinimum>
+    <NetCoreAppMinimum Condition="'$(DotNetBuildSourceOnly)' == 'true'">$(NetCoreAppCurrent)</NetCoreAppMinimum>
 
     <!-- when this is updated, make sure to keep $(_NetCoreAppToolCurrent)
          in src/mono/wasm/build/WasmApp.LocalBuild.props
@@ -110,9 +110,9 @@
     <NetFrameworkCurrent>net48</NetFrameworkCurrent>
     <NetFrameworkToolCurrent>net472</NetFrameworkToolCurrent>
     <!-- Don't build for NETFramework during source-build. -->
-    <NetFrameworkMinimum Condition="'$(DotNetBuildFromSource)' == 'true'" />
-    <NetFrameworkToolCurrent Condition="'$(DotNetBuildFromSource)' == 'true'" />
-    <NetFrameworkCurrent Condition="'$(DotNetBuildFromSource)' == 'true'" />
+    <NetFrameworkMinimum Condition="'$(DotNetBuildSourceOnly)' == 'true'" />
+    <NetFrameworkToolCurrent Condition="'$(DotNetBuildSourceOnly)' == 'true'" />
+    <NetFrameworkCurrent Condition="'$(DotNetBuildSourceOnly)' == 'true'" />
 
     <!-- Important: Set this to the GA version (or a close approximation) during servicing and adjust the TFM property below. -->
     <ApiCompatNetCoreAppBaselineVersion>8.0.0</ApiCompatNetCoreAppBaselineVersion>
@@ -176,7 +176,7 @@
     <MonoTargetsTasksAssemblyPath>$([MSBuild]::NormalizePath('$(MonoTargetsTasksDir)', 'MonoTargetsTasks.dll'))</MonoTargetsTasksAssemblyPath>
     <TestExclusionListTasksAssemblyPath>$([MSBuild]::NormalizePath('$(TestExclusionListTasksDir)', 'TestExclusionListTasks.dll'))</TestExclusionListTasksAssemblyPath>
     <CoreCLRToolPath>$([MSBuild]::NormalizeDirectory('$(ArtifactsBinDir)', 'coreclr', '$(TargetOS).$(TargetArchitecture).$(RuntimeConfiguration)'))</CoreCLRToolPath>
-    <ILAsmToolPath Condition="'$(DotNetBuildFromSource)' == 'true' or '$(BuildArchitecture)' == 's390x' or '$(BuildArchitecture)' == 'ppc64le'">$(CoreCLRToolPath)</ILAsmToolPath>
+    <ILAsmToolPath Condition="'$(DotNetBuildSourceOnly)' == 'true' or '$(BuildArchitecture)' == 's390x' or '$(BuildArchitecture)' == 'ppc64le'">$(CoreCLRToolPath)</ILAsmToolPath>
     <WasmtimeDir Condition="'$(WasmtimeDir)' == '' and '$(WASMTIME_PATH)' != '' and Exists($(WASMTIME_PATH))">$(WASMTIME_PATH)</WasmtimeDir>
     <WasmtimeDir Condition="'$(WasmtimeDir)' == ''">$([MSBuild]::NormalizeDirectory($(ArtifactsObjDir), 'wasmtime'))</WasmtimeDir>
     <InstallWasmtimeForTests Condition="'$(InstallWasmtimeForTests)' == '' and !Exists($(WasmtimeDir))">true</InstallWasmtimeForTests>
@@ -184,7 +184,7 @@
   </PropertyGroup>
 
   <PropertyGroup Label="CalculatePortableBuild">
-    <PortableBuild Condition="'$(PortableBuild)' == '' and '$(DotNetBuildFromSource)' == 'true'">false</PortableBuild>
+    <PortableBuild Condition="'$(PortableBuild)' == '' and '$(DotNetBuildSourceOnly)' == 'true'">false</PortableBuild>
     <PortableBuild Condition="'$(PortableBuild)' == ''">true</PortableBuild>
   </PropertyGroup>
 
@@ -298,8 +298,8 @@
 
   <!--Feature switches -->
   <PropertyGroup>
-    <NoPgoOptimize Condition="'$(NoPgoOptimize)' == '' and '$(DotNetBuildFromSource)' == 'true'">true</NoPgoOptimize>
-    <EnableNgenOptimization Condition="'$(EnableNgenOptimization)' == '' and '$(DotNetBuildFromSource)' == 'true'">false</EnableNgenOptimization>
+    <NoPgoOptimize Condition="'$(NoPgoOptimize)' == '' and '$(DotNetBuildSourceOnly)' == 'true'">true</NoPgoOptimize>
+    <EnableNgenOptimization Condition="'$(EnableNgenOptimization)' == '' and '$(DotNetBuildSourceOnly)' == 'true'">false</EnableNgenOptimization>
     <EnableNgenOptimization Condition="'$(EnableNgenOptimization)' == '' and ('$(Configuration)' == 'Release' or '$(Configuration)' == 'Checked')">true</EnableNgenOptimization>
     <!-- Enable NuGet static graph evaluation to optimize incremental restore -->
     <RestoreUseStaticGraphEvaluation>true</RestoreUseStaticGraphEvaluation>
@@ -380,7 +380,7 @@
     <!-- Always pass portable to override arcade sdk which uses embedded for local builds -->
     <DebugType>portable</DebugType>
     <DebugSymbols>true</DebugSymbols>
-    <KeepNativeSymbols Condition="'$(KeepNativeSymbols)' == '' and '$(DotNetBuildFromSource)' == 'true'">true</KeepNativeSymbols>
+    <KeepNativeSymbols Condition="'$(KeepNativeSymbols)' == '' and '$(DotNetBuildSourceOnly)' == 'true'">true</KeepNativeSymbols>
     <KeepNativeSymbols Condition="'$(KeepNativeSymbols)' == ''">false</KeepNativeSymbols>
     <!-- Used for launchSettings.json and runtime config files. -->
     <AppDesignerFolder>Properties</AppDesignerFolder>
diff --git a/Directory.Build.targets b/Directory.Build.targets
index 43564d36255..f731eedc390 100644
--- a/Directory.Build.targets
+++ b/Directory.Build.targets
@@ -21,7 +21,7 @@
   When .NET gets built from source, make the SDK aware there are bootstrap packages
   for Microsoft.NETCore.App.Runtime.<rid> and Microsoft.NETCore.App.Crossgen2.<rid>.
   -->
-  <ItemGroup Condition="'$(DotNetBuildFromSource)' == 'true'">
+  <ItemGroup Condition="'$(DotNetBuildSourceOnly)' == 'true'">
     <KnownFrameworkReference Update="Microsoft.NETCore.App">
       <RuntimePackRuntimeIdentifiers
         Condition="'%(TargetFramework)' == '$(NetCoreAppCurrent)'">%(RuntimePackRuntimeIdentifiers);$(PackageRID)</RuntimePackRuntimeIdentifiers>
@@ -88,7 +88,7 @@
   <PropertyGroup>
     <!-- when building from source we need to use the current version of MetadataLoadContext as the toolset version, but source-build imports
          another props file which overrides the SystemReflectionMetadataLoadContextVersion from Version.props so we can't set it there -->
-    <SystemReflectionMetadataLoadContextToolsetVersion Condition="'$(DotNetBuildFromSource)' == 'true'">$(SystemReflectionMetadataLoadContextVersion)</SystemReflectionMetadataLoadContextToolsetVersion>
+    <SystemReflectionMetadataLoadContextToolsetVersion Condition="'$(DotNetBuildSourceOnly)' == 'true'">$(SystemReflectionMetadataLoadContextVersion)</SystemReflectionMetadataLoadContextToolsetVersion>
   </PropertyGroup>
 
   <Target Name="ValidateTargetOSLowercase"
diff --git a/eng/Analyzers.targets b/eng/Analyzers.targets
index 7cb7a76abac..856ceb89ae9 100644
--- a/eng/Analyzers.targets
+++ b/eng/Analyzers.targets
@@ -8,7 +8,7 @@
   </PropertyGroup>
   <PropertyGroup>
     <!-- Disable analyzers in sourcebuild -->
-    <RunAnalyzers Condition="'$(DotNetBuildFromSource)' == 'true'">false</RunAnalyzers>
+    <RunAnalyzers Condition="'$(DotNetBuildSourceOnly)' == 'true'">false</RunAnalyzers>
     <EnableNETAnalyzers Condition="'$(EnableNETAnalyzers)' == ''">$(RunAnalyzers)</EnableNETAnalyzers>
   </PropertyGroup>
   <PropertyGroup Condition="'$(RunAnalyzers)' != 'false'">
diff --git a/eng/DiaSymReaderNative.targets b/eng/DiaSymReaderNative.targets
index caa482f4b6e..ac8dc7e36a0 100644
--- a/eng/DiaSymReaderNative.targets
+++ b/eng/DiaSymReaderNative.targets
@@ -18,7 +18,7 @@
     package can't be referenced directly but rather has to have it's assets manually copied 
     out. This logic is responsible for doing that.
   -->
-  <ItemGroup Condition="'$(DotNetBuildFromSource)' != 'true'">
+  <ItemGroup Condition="'$(DotNetBuildSourceOnly)' != 'true'">
     <Content Include="$(NuGetPackageRoot)\microsoft.diasymreader.native\$(MicrosoftDiaSymReaderNativeVersion)\runtimes\win\native\Microsoft.DiaSymReader.Native.x86.dll">
       <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
       <Visible>false</Visible>
diff --git a/eng/DotNetBuild.props b/eng/DotNetBuild.props
index fbad52bdac7..8527ec175ad 100644
--- a/eng/DotNetBuild.props
+++ b/eng/DotNetBuild.props
@@ -38,9 +38,9 @@
   <Target Name="GetRuntimeSourceBuildCommandConfiguration"
           BeforeTargets="GetSourceBuildCommandConfiguration">
     <PropertyGroup>
-      <!-- Properties that control the source-build configuration should be added to the repository and guarded with the DotNetBuildFromSource Condition.
-           This allows to build the repository using './build.sh <args> /p:DotNetBuildFromSource=true'.
-           Properties that control flags from source-build, and the expected output for source-build should be added to this file. -->
+      <!-- Properties that control source-only build configurations should be added to the repository and guarded with DotNetBuildSourceOnly conditions.
+           This allows to build the repository using './build.sh <args> /p:DotNetBuildSourceOnly=true'.
+           Properties that control flags from the VMR build, and the expected output for the VMR build should be added to this file. -->
       <InnerBuildArgs>$(InnerBuildArgs) $(FlagParameterPrefix)arch $(TargetArch)</InnerBuildArgs>
       <InnerBuildArgs Condition="'$(DotNetBuildSourceOnly)' != 'true'">$(InnerBuildArgs) $(FlagParameterPrefix)os $(TargetOS)</InnerBuildArgs>
       <InnerBuildArgs Condition="'$(TargetArch)' != '$(_hostArch)' and '$(ShortStack)' != 'true'">$(InnerBuildArgs) $(FlagParameterPrefix)cross</InnerBuildArgs>
@@ -63,8 +63,7 @@
       <InnerBuildArgs Condition="'$(DotNetBuildRuntimeNativeAOTRuntimePack)' == 'true'">$(InnerBuildArgs) $(FlagParameterPrefix)s clr.nativeaotlibs+clr.nativeaotruntime+libs+packs /p:BuildNativeAOTRuntimePack=true /p:SkipLibrariesNativeRuntimePackages=true</InnerBuildArgs>
 
       <!-- This prop needs to be passed to the inner build manually as the BaseInnerSourceBuildCommand gets overriden above -->
-      <InnerBuildArgs Condition="'$(ArcadeBuildFromSource)' == 'true'">$(InnerBuildArgs) /p:ArcadeBuildFromSource=true</InnerBuildArgs>
-      <InnerBuildArgs Condition="'$(ArcadeBuildVertical)' == 'true'">$(InnerBuildArgs) /p:ArcadeBuildVertical=true</InnerBuildArgs>
+      <InnerBuildArgs Condition="'$(DotNetBuildRepo)' == 'true'">$(InnerBuildArgs) /p:DotNetBuildRepo=true</InnerBuildArgs>
       <InnerBuildArgs Condition="'$(OfficialBuildId)' != ''">$(InnerBuildArgs) /p:OfficialBuildId=$(OfficialBuildId)</InnerBuildArgs>
       <InnerBuildArgs Condition="'$(ContinuousIntegrationBuild)' != ''">$(InnerBuildArgs) /p:ContinuousIntegrationBuild=$(ContinuousIntegrationBuild)</InnerBuildArgs>
       <InnerBuildArgs Condition="'$(PortableBuild)' != ''">$(InnerBuildArgs) /p:PortableBuild=$(PortableBuild)</InnerBuildArgs>
diff --git a/eng/Subsets.props b/eng/Subsets.props
index 9088b48f285..cd4532699b1 100644
--- a/eng/Subsets.props
+++ b/eng/Subsets.props
@@ -40,7 +40,7 @@
     <DefaultSubsets Condition="'$(TargetsMobile)' == 'true'">mono+libs+packs</DefaultSubsets>
     <DefaultSubsets Condition="'$(TargetsLinuxBionic)' == 'true'">mono+libs+host+packs</DefaultSubsets>
     <!-- In source build, mono is only supported as primary runtime flavor. On Windows mono is supported for x86/x64 only. -->
-    <DefaultSubsets Condition="('$(DotNetBuildFromSource)' == 'true' and '$(PrimaryRuntimeFlavor)' != 'Mono') or ('$(TargetOS)' == 'windows' and '$(TargetArchitecture)' != 'x86' and '$(TargetArchitecture)' != 'x64')">clr+libs+tools+host+packs</DefaultSubsets>
+    <DefaultSubsets Condition="('$(DotNetBuildSourceOnly)' == 'true' and '$(PrimaryRuntimeFlavor)' != 'Mono') or ('$(TargetOS)' == 'windows' and '$(TargetArchitecture)' != 'x86' and '$(TargetArchitecture)' != 'x64')">clr+libs+tools+host+packs</DefaultSubsets>
   </PropertyGroup>
 
   <!-- Init _subset here to allow RuntimeFlavor to be set as early as possible -->
@@ -85,13 +85,13 @@
     <DefaultToolsSubsets>tools.illink</DefaultToolsSubsets>
 
     <DefaultHostSubsets>host.native+host.tools+host.pkg</DefaultHostSubsets>
-    <DefaultHostSubsets Condition="'$(DotNetBuildFromSource)' != 'true'">$(DefaultHostSubsets)+host.pretest+host.tests</DefaultHostSubsets>
+    <DefaultHostSubsets Condition="'$(DotNetBuildSourceOnly)' != 'true'">$(DefaultHostSubsets)+host.pretest+host.tests</DefaultHostSubsets>
     <DefaultHostSubsets Condition="'$(RuntimeFlavor)' != '$(PrimaryRuntimeFlavor)' or '$(TargetsMobile)' == 'true'"></DefaultHostSubsets>
     <DefaultHostSubsets Condition="'$(RuntimeFlavor)' != '$(PrimaryRuntimeFlavor)' and '$(TargetsMobile)' != 'true'">host.native</DefaultHostSubsets>
 
     <DefaultPacksSubsets>packs.product</DefaultPacksSubsets>
-    <DefaultPacksSubsets Condition="'$(BuildMonoAOTCrossCompilerOnly)' != 'true' and '$(DotNetBuildFromSource)' != 'true'">$(DefaultPacksSubsets)+packs.tests</DefaultPacksSubsets>
-    <DefaultPacksSubsets Condition="'$(DotNetBuildFromSource)' == 'true'">$(DefaultPacksSubsets)+packs.installers</DefaultPacksSubsets>
+    <DefaultPacksSubsets Condition="'$(BuildMonoAOTCrossCompilerOnly)' != 'true' and '$(DotNetBuildSourceOnly)' != 'true'">$(DefaultPacksSubsets)+packs.tests</DefaultPacksSubsets>
+    <DefaultPacksSubsets Condition="'$(DotNetBuildSourceOnly)' == 'true'">$(DefaultPacksSubsets)+packs.installers</DefaultPacksSubsets>
     <DefaultPacksSubsets Condition="'$(RuntimeFlavor)' != 'Mono' and '$(ForceBuildMobileManifests)' == 'true'">$(DefaultPacksSubsets)+mono.manifests</DefaultPacksSubsets>
   </PropertyGroup>
 
@@ -341,7 +341,7 @@
                              $(CoreClrProjectRoot)tools\aot\ILCompiler\repro\repro.csproj;
                              $(CoreClrProjectRoot)tools\r2rtest\R2RTest.csproj;
                              $(CoreClrProjectRoot)tools\PdbChecker\PdbChecker.csproj;
-                             $(CoreClrProjectRoot)tools\AssemblyChecker\AssemblyChecker.csproj" Category="clr" Condition="'$(DotNetBuildFromSource)' != 'true'"/>
+                             $(CoreClrProjectRoot)tools\AssemblyChecker\AssemblyChecker.csproj" Category="clr" Condition="'$(DotNetBuildSourceOnly)' != 'true'"/>
     <ProjectToBuild Include="$(CoreClrProjectRoot)tools\aot\crossgen2\crossgen2.csproj" Category="clr" />
     <ProjectToBuild Include="$(CoreClrProjectRoot)tools\aot\ILCompiler.Build.Tasks\ILCompiler.Build.Tasks.csproj" Category="clr" Condition="'$(NativeAotSupported)' == 'true'" />
     <ProjectToBuild Include="$(CoreClrProjectRoot)tools\aot\ILCompiler\ILCompiler.csproj" Category="clr" Condition="'$(NativeAotSupported)' == 'true'" />
@@ -355,11 +355,11 @@
 
   <ItemGroup Condition="$(_subset.Contains('+clr.toolstests+'))">
     <ProjectToBuild Include="$(CoreClrProjectRoot)tools\aot\ILCompiler.TypeSystem.Tests\ILCompiler.TypeSystem.Tests.csproj"
-      Test="true" Category="clr" Condition="'$(DotNetBuildFromSource)' != 'true'"/>
+      Test="true" Category="clr" Condition="'$(DotNetBuildSourceOnly)' != 'true'"/>
     <ProjectToBuild Include="$(CoreClrProjectRoot)tools\aot\ILCompiler.Compiler.Tests\ILCompiler.Compiler.Tests.csproj"
-      Test="true" Category="clr" Condition="'$(DotNetBuildFromSource)' != 'true' and '$(NativeAotSupported)' == 'true'"/>
+      Test="true" Category="clr" Condition="'$(DotNetBuildSourceOnly)' != 'true' and '$(NativeAotSupported)' == 'true'"/>
     <ProjectToBuild Include="$(CoreClrProjectRoot)tools\aot\ILCompiler.Trimming.Tests\ILCompiler.Trimming.Tests.csproj"
-      Test="true" Category="clr" Condition="'$(DotNetBuildFromSource)' != 'true' and '$(NativeAotSupported)' == 'true'"/>
+      Test="true" Category="clr" Condition="'$(DotNetBuildSourceOnly)' != 'true' and '$(NativeAotSupported)' == 'true'"/>
   </ItemGroup>
 
   <ItemGroup Condition="$(_subset.Contains('+tools.illink+'))">
@@ -393,7 +393,7 @@
 
   <ItemGroup Condition="$(_subset.Contains('+clr.packages+')) and '$(PgoInstrument)' != 'true'">
     <ProjectToBuild Include="$(CoreClrProjectRoot).nuget\coreclr-packages.proj" Pack="true" Category="clr" />
-    <ProjectToBuild Include="$(CoreClrProjectRoot)tools\dotnet-pgo\dotnet-pgo-pack.proj" Pack="true" Category="clr" Condition="'$(DotNetBuildFromSource)' != 'true' and '$(RuntimeFlavor)' != 'Mono'"/>
+    <ProjectToBuild Include="$(CoreClrProjectRoot)tools\dotnet-pgo\dotnet-pgo-pack.proj" Pack="true" Category="clr" Condition="'$(DotNetBuildSourceOnly)' != 'true' and '$(RuntimeFlavor)' != 'Mono'"/>
   </ItemGroup>
 
   <ItemGroup Condition="$(_subset.Contains('+clr.nativeaotlibs+')) and '$(NativeAotSupported)' == 'true'">
diff --git a/eng/Tools.props b/eng/Tools.props
index 01cae1f2b23..3baa40f4f32 100644
--- a/eng/Tools.props
+++ b/eng/Tools.props
@@ -11,7 +11,7 @@
   </ItemGroup>
 
   <!-- excluded from source build -->
-  <ItemGroup Condition="'$(DotNetBuildFromSource)' != 'true'">
+  <ItemGroup Condition="'$(DotNetBuildSourceOnly)' != 'true'">
     <PackageReference Include="Microsoft.DotNet.VersionTools.Tasks" Version="$(MicrosoftDotNetVersionToolsTasksVersion)" />
   </ItemGroup>
 
diff --git a/eng/Versions.props b/eng/Versions.props
index 29ede69058e..ea03f538ca3 100644
--- a/eng/Versions.props
+++ b/eng/Versions.props
@@ -26,8 +26,8 @@
     <FlagNetStandard1XDependencies Condition="'$(FlagNetStandard1XDependencies)' == ''">true</FlagNetStandard1XDependencies>
     <!-- Runtime controls its dependency graph via Traversal projects and doesn't want or need Arcade's ExcludeFrom infrastructure. -->
     <DisableArcadeExcludeFromBuildSupport>true</DisableArcadeExcludeFromBuildSupport>
-    <!-- Use SDK compilers in full source-build. -->
-    <UsingToolMicrosoftNetCompilers Condition="'$(DotNetBuildFromSourceFlavor)' != 'Product'">true</UsingToolMicrosoftNetCompilers>
+    <!-- Use SDK compilers in full VMR builds. -->
+    <UsingToolMicrosoftNetCompilers Condition="'$(DotNetBuildOrchestrator)' != 'true'">true</UsingToolMicrosoftNetCompilers>
   </PropertyGroup>
   <ItemGroup>
     <WorkloadSdkBandVersions Include="$(SdkBandVersion)" SupportsMachineArch="true" />
diff --git a/eng/codeOptimization.targets b/eng/codeOptimization.targets
index d42a39e3dfd..5f990a98347 100644
--- a/eng/codeOptimization.targets
+++ b/eng/codeOptimization.targets
@@ -30,7 +30,7 @@
   <Target Name="AddReadyToRunPgoOptions" DependsOnTargets="ResolveRuntimeFilesFromLocalBuild" BeforeTargets="ResolveReadyToRunCompilers" Condition="'$(PublishReadyToRun)' == 'true'">
     <PropertyGroup>
       <!-- Only use mibc files if UsingToolIbcOptimization is false. Allows enabling/disabling using ibc instead of mibc data -->
-      <IncludeMibcFilesInReadyToRun Condition="'$(UsingToolIbcOptimization)' != 'true' and '$(EnableNgenOptimization)' == 'true' and '$(DotNetBuildFromSource)' != 'true'">true</IncludeMibcFilesInReadyToRun>
+      <IncludeMibcFilesInReadyToRun Condition="'$(UsingToolIbcOptimization)' != 'true' and '$(EnableNgenOptimization)' == 'true' and '$(DotNetBuildSourceOnly)' != 'true'">true</IncludeMibcFilesInReadyToRun>
     </PropertyGroup>
     <ItemGroup>
       <PublishReadyToRunPgoFiles Condition="'$(IncludeMibcFilesInReadyToRun)' == 'true'" Include="$(CoreCLRArtifactsPath)StandardOptimizationData.mibc"/>
diff --git a/eng/nativepgo.targets b/eng/nativepgo.targets
index 9f5984efdb6..99344e20b8e 100644
--- a/eng/nativepgo.targets
+++ b/eng/nativepgo.targets
@@ -9,7 +9,7 @@
     <_NativeOptimizationDataPackageTarget Condition="'$(TargetOS)' == 'windows'">windows_nt-$(TargetArchitecture.ToLower())</_NativeOptimizationDataPackageTarget>
 
   </PropertyGroup>
-  <ItemGroup Condition="'$(optimizationPGOCoreCLRVersion)'!='' and '$(DotNetBuildFromSource)' != 'true'">
+  <ItemGroup Condition="'$(optimizationPGOCoreCLRVersion)'!='' and '$(DotNetBuildSourceOnly)' != 'true'">
     <PackageReference Include="optimization.windows_nt-x64.PGO.CoreCLR"
       Version="$(optimizationPGOCoreCLRVersion)"
       GeneratePathProperty="true" />
diff --git a/eng/packaging.targets b/eng/packaging.targets
index fde0ccb624b..554e705e188 100644
--- a/eng/packaging.targets
+++ b/eng/packaging.targets
@@ -4,12 +4,12 @@
     <!-- Package Validation isn't helpful when authoring shared framework packages. -->
     <EnablePackageValidation Condition="'$(EnablePackageValidation)' == '' and
                                         '$(UsingMicrosoftDotNetSharedFrameworkSdk)' != 'true' and
-                                        '$(DotNetBuildFromSource)' != 'true'">true</EnablePackageValidation>
+                                        '$(DotNetBuildSourceOnly)' != 'true'">true</EnablePackageValidation>
     <!-- Don't perform baseline validation if we don't have a stable prebuilt version.
          Don't attempt to restore prebuilts during source-build. -->
     <DisablePackageBaselineValidation Condition="'$(IsShipping)' == 'false' or
                                                  '$(SuppressFinalPackageVersion)' == 'true' or
-                                                 '$(DotNetBuildFromSource)' == 'true'">true</DisablePackageBaselineValidation>
+                                                 '$(DotNetBuildSourceOnly)' == 'true'">true</DisablePackageBaselineValidation>
     <PackageValidationBaselineVersion Condition="'$(PackageValidationBaselineVersion)' == ''">$(ApiCompatNetCoreAppBaselineVersion)</PackageValidationBaselineVersion>
 
     <BeforePack>$(BeforePack);IncludeAnalyzersInPackage;AddNETStandardCompatErrorFileForPackaging</BeforePack>
@@ -39,7 +39,7 @@
     <!-- When in source-build we need to generate all packages when building for all configurations even in servicing. -->
     <GeneratePackageOnBuild Condition="'$(GeneratePackageOnBuild)' != 'true' and
                                        '$(BuildAllConfigurations)' == 'true' and
-                                       '$(DotNetBuildFromSource)' == 'true'">true</GeneratePackageOnBuild>
+                                       '$(DotNetBuildSourceOnly)' == 'true'">true</GeneratePackageOnBuild>
 
     <!-- During NoBuild pack invocations, skip project reference build. Necessary for the IncludeProjectReferencesWithPackAttributeInPackage target. -->
     <BuildProjectReferences Condition="'$(NoBuild)' == 'true'">false</BuildProjectReferences>
@@ -307,7 +307,7 @@
   <Target Name="ValidateServicingVersionIsProperlySet"
           Condition="'$(PreReleaseVersionLabel)' == 'servicing' and
                      '$(PackageUseIncrementalServicingVersion)' == 'true' and
-                     '$(DotNetBuildFromSource)' != 'true'"
+                     '$(DotNetBuildSourceOnly)' != 'true'"
           AfterTargets="GenerateNuspec">
     <Error Condition="'$(ServicingVersion)' == '0'" Text="ServicingVersion is set to 0 and it should be an increment of the patch version from the last released package." />
   </Target>
diff --git a/eng/resolveContract.targets b/eng/resolveContract.targets
index bd6fc7de7fc..fb93fcd09e9 100644
--- a/eng/resolveContract.targets
+++ b/eng/resolveContract.targets
@@ -76,7 +76,7 @@
        all the inputs available, some suppressions might only apply to one or the other and hence unnecessary
        suppressions can't be determined.
        Disable the validation under source build as that might use an out-of-date SDK and not the ApiCompat.Task package. -->
-  <PropertyGroup Condition="('$(IsPackable)' == 'true' and '$(IsRuntimeAndReferenceAssembly)' != 'true') or '$(DotNetBuildFromSource)' == 'true'">
+  <PropertyGroup Condition="('$(IsPackable)' == 'true' and '$(IsRuntimeAndReferenceAssembly)' != 'true') or '$(DotNetBuildSourceOnly)' == 'true'">
     <ApiCompatPreserveUnnecessarySuppressions>true</ApiCompatPreserveUnnecessarySuppressions>
     <ApiCompatPermitUnnecessarySuppressions>true</ApiCompatPermitUnnecessarySuppressions>
   </PropertyGroup>
@@ -137,7 +137,7 @@
                       Version="$(MicrosoftDotNetGenApiVersion)"
                       PrivateAssets="all"
                       IsImplicitlyDefined="true"
-                      Condition="'$(DotNetBuildFromSource)' != 'true'" />
+                      Condition="'$(DotNetBuildSourceOnly)' != 'true'" />
   </ItemGroup>
 
   <!-- Generate a .txt file with all public types of the project referenced by ProjectForGenAPIDocIdGeneration (e.g. System.Private.CoreLib or System.Private.Uri implementation assembly).
diff --git a/src/coreclr/.nuget/coreclr-packages.proj b/src/coreclr/.nuget/coreclr-packages.proj
index 80e3f60a919..f7c43af0e78 100644
--- a/src/coreclr/.nuget/coreclr-packages.proj
+++ b/src/coreclr/.nuget/coreclr-packages.proj
@@ -1,11 +1,11 @@
 <Project Sdk="Microsoft.Build.Traversal" DefaultTargets="Pack">
-  <ItemGroup Condition="'$(TargetOS)' == 'windows' or '$(DotNetBuildFromSource)' == 'true'">
+  <ItemGroup Condition="'$(TargetOS)' == 'windows' or '$(DotNetBuildSourceOnly)' == 'true'">
     <ProjectReference Include="Microsoft.NET.Sdk.IL\Microsoft.NET.Sdk.IL.pkgproj" />
-    <ProjectReference Include="Microsoft.ILVerification\Microsoft.ILVerification.pkgproj" Condition="'$(DotNetBuildFromSource)' != 'true'" />
-    <ProjectReference Include="dotnet-ilverify\dotnet-ilverify.pkgproj" Condition="'$(DotNetBuildFromSource)' != 'true'" />
+    <ProjectReference Include="Microsoft.ILVerification\Microsoft.ILVerification.pkgproj" Condition="'$(DotNetBuildSourceOnly)' != 'true'" />
+    <ProjectReference Include="dotnet-ilverify\dotnet-ilverify.pkgproj" Condition="'$(DotNetBuildSourceOnly)' != 'true'" />
   </ItemGroup>
 
-  <ItemGroup Condition="'$(RuntimeFlavor)' == 'CoreCLR' and '$(DotNetBuildFromSource)' != 'true'">
+  <ItemGroup Condition="'$(RuntimeFlavor)' == 'CoreCLR' and '$(DotNetBuildSourceOnly)' != 'true'">
     <ProjectReference Include="ILCompiler.Reflection.ReadyToRun.Experimental\ILCompiler.Reflection.ReadyToRun.Experimental.pkgproj" />
   </ItemGroup>
 
diff --git a/src/coreclr/crossgen-corelib.proj b/src/coreclr/crossgen-corelib.proj
index 1c63c777c7e..ae2741ea9c9 100644
--- a/src/coreclr/crossgen-corelib.proj
+++ b/src/coreclr/crossgen-corelib.proj
@@ -6,7 +6,7 @@
 
   <ItemGroup>
     <ProjectReference Include="$(CoreClrProjectRoot)/tools/aot/crossgen2/crossgen2_inbuild.csproj" OutputItemType="Crossgen2" />
-    <ProjectReference Include="$(CoreClrProjectRoot)/tools/dotnet-pgo/dotnet-pgo.csproj" OutputItemType="DotNetPgo" Condition="'$(DotNetBuildFromSource)' != 'true'" />
+    <ProjectReference Include="$(CoreClrProjectRoot)/tools/dotnet-pgo/dotnet-pgo.csproj" OutputItemType="DotNetPgo" Condition="'$(DotNetBuildSourceOnly)' != 'true'" />
     <ProjectReference Include="$([MSBuild]::NormalizePath('$(CoreClrProjectRoot)', 'System.Private.CoreLib', 'System.Private.CoreLib.csproj'))" OutputItemType="CoreLib" />
   </ItemGroup>
 
diff --git a/src/coreclr/tools/SuperFileCheck/SuperFileCheck.csproj b/src/coreclr/tools/SuperFileCheck/SuperFileCheck.csproj
index a3cf4fe6be2..908da8fe32c 100644
--- a/src/coreclr/tools/SuperFileCheck/SuperFileCheck.csproj
+++ b/src/coreclr/tools/SuperFileCheck/SuperFileCheck.csproj
@@ -40,7 +40,7 @@
 
   <ItemGroup>
     <PackageReference Include="Microsoft.CodeAnalysis.CSharp" Version="$(MicrosoftCodeAnalysisCSharpVersion)" />
-    <PackageDownload Condition="'$(DotNetBuildFromSource)' != 'true'" Include="runtime.$(JITToolsRid).Microsoft.NETCore.Runtime.JIT.Tools">
+    <PackageDownload Condition="'$(DotNetBuildSourceOnly)' != 'true'" Include="runtime.$(JITToolsRid).Microsoft.NETCore.Runtime.JIT.Tools">
       <Version>[$(JITToolsVersion)]</Version>
     </PackageDownload>
   </ItemGroup>
diff --git a/src/coreclr/tools/aot/ILCompiler.Compiler/ILCompiler.Compiler.csproj b/src/coreclr/tools/aot/ILCompiler.Compiler/ILCompiler.Compiler.csproj
index f4a9ecc84a7..3e18e278ac1 100644
--- a/src/coreclr/tools/aot/ILCompiler.Compiler/ILCompiler.Compiler.csproj
+++ b/src/coreclr/tools/aot/ILCompiler.Compiler/ILCompiler.Compiler.csproj
@@ -15,7 +15,7 @@
     <GenerateDependencyFile>false</GenerateDependencyFile>
     <Configurations>Debug;Release;Checked</Configurations>
 
-    <NoWarn Condition="'$(DotNetBuildFromSource)' == 'true'">$(NoWarn);CS8524</NoWarn>
+    <NoWarn Condition="'$(DotNetBuildSourceOnly)' == 'true'">$(NoWarn);CS8524</NoWarn>
     <NoWarn>$(NoWarn);CA1859</NoWarn>
   </PropertyGroup>
 
@@ -24,7 +24,7 @@
     <ProjectReference Include="..\ILCompiler.MetadataTransform\ILCompiler.MetadataTransform.csproj" />
     <ProjectReference Include="..\ILCompiler.TypeSystem\ILCompiler.TypeSystem.csproj" />
 
-    <PackageReference Condition="'$(DotNetBuildFromSource)' != 'true'" Include="StaticCs" Version="$(StaticCsVersion)">
+    <PackageReference Condition="'$(DotNetBuildSourceOnly)' != 'true'" Include="StaticCs" Version="$(StaticCsVersion)">
       <PrivateAssets>all</PrivateAssets>
       <ExcludeAssets>contentfiles</ExcludeAssets> <!-- We include our own copy of the ClosedAttribute to work in source build -->
     </PackageReference>
diff --git a/src/coreclr/tools/aot/ILCompiler.ReadyToRun/ILCompiler.ReadyToRun.csproj b/src/coreclr/tools/aot/ILCompiler.ReadyToRun/ILCompiler.ReadyToRun.csproj
index 9db169fb6da..f240269e0ad 100644
--- a/src/coreclr/tools/aot/ILCompiler.ReadyToRun/ILCompiler.ReadyToRun.csproj
+++ b/src/coreclr/tools/aot/ILCompiler.ReadyToRun/ILCompiler.ReadyToRun.csproj
@@ -16,7 +16,7 @@
     <GenerateDependencyFile>false</GenerateDependencyFile>
     <Configurations>Debug;Release;Checked</Configurations>
     <RunAnalyzers>false</RunAnalyzers>
-    <NoWarn Condition="'$(DotNetBuildFromSource)' == 'true'">$(NoWarn);CS8524</NoWarn>
+    <NoWarn Condition="'$(DotNetBuildSourceOnly)' == 'true'">$(NoWarn);CS8524</NoWarn>
   </PropertyGroup>
 
   <ItemGroup>
@@ -24,7 +24,7 @@
     <ProjectReference Include="..\ILCompiler.Diagnostics\ILCompiler.Diagnostics.csproj" />
     <ProjectReference Include="..\ILCompiler.TypeSystem\ILCompiler.TypeSystem.csproj" />
 
-    <PackageReference Condition="'$(DotNetBuildFromSource)' != 'true'" Include="StaticCs" Version="$(StaticCsVersion)">
+    <PackageReference Condition="'$(DotNetBuildSourceOnly)' != 'true'" Include="StaticCs" Version="$(StaticCsVersion)">
       <PrivateAssets>all</PrivateAssets>
       <ExcludeAssets>contentfiles</ExcludeAssets> <!-- We include our own copy of the ClosedAttribute to work in source build -->
     </PackageReference>
diff --git a/src/coreclr/tools/aot/ILCompiler.TypeSystem/ILCompiler.TypeSystem.csproj b/src/coreclr/tools/aot/ILCompiler.TypeSystem/ILCompiler.TypeSystem.csproj
index 268e2e6b124..663dadfd936 100644
--- a/src/coreclr/tools/aot/ILCompiler.TypeSystem/ILCompiler.TypeSystem.csproj
+++ b/src/coreclr/tools/aot/ILCompiler.TypeSystem/ILCompiler.TypeSystem.csproj
@@ -9,7 +9,7 @@
     <Platforms>x64;x86</Platforms>
     <PlatformTarget>AnyCPU</PlatformTarget>
     <AppendTargetFrameworkToOutputPath>false</AppendTargetFrameworkToOutputPath>
-    <EnableDiaSymReaderUse Condition="'$(DotNetBuildFromSource)' != 'true'">true</EnableDiaSymReaderUse>
+    <EnableDiaSymReaderUse Condition="'$(DotNetBuildSourceOnly)' != 'true'">true</EnableDiaSymReaderUse>
     <DefineConstants Condition="'$(EnableDiaSymReaderUse)' != 'true'">$(DefineConstants);DISABLE_UNMANAGED_PDB_SYMBOLS</DefineConstants>
 
     <!-- We're binplacing these into an existing publish layout so that F5 build in VS updates
@@ -693,7 +693,7 @@
   </ItemGroup>
 
   <ItemGroup>
-    <PackageReference Include="Microsoft.CodeAnalysis.BannedApiAnalyzers" Version="$(MicrosoftCodeAnalysisBannedApiAnalyzersVersion)" Condition="'$(DotNetBuildFromSource)' != 'true'">
+    <PackageReference Include="Microsoft.CodeAnalysis.BannedApiAnalyzers" Version="$(MicrosoftCodeAnalysisBannedApiAnalyzersVersion)" Condition="'$(DotNetBuildSourceOnly)' != 'true'">
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
       <PrivateAssets>all</PrivateAssets>
     </PackageReference>
diff --git a/src/coreclr/tools/aot/ILCompiler/ILCompiler.csproj b/src/coreclr/tools/aot/ILCompiler/ILCompiler.csproj
index e601d1c14cf..7549877334c 100644
--- a/src/coreclr/tools/aot/ILCompiler/ILCompiler.csproj
+++ b/src/coreclr/tools/aot/ILCompiler/ILCompiler.csproj
@@ -11,7 +11,7 @@
   <PropertyGroup Condition="'$(BuildingInsideVisualStudio)' != 'true'">
     <PublishDir>$(RuntimeBinDir)ilc-published/</PublishDir>
     <!-- Can't use NativeAOT in source build yet https://github.com/dotnet/runtime/issues/66859 -->
-    <NativeAotSupported Condition="'$(DotNetBuildFromSource)' == 'true'">false</NativeAotSupported>
+    <NativeAotSupported Condition="'$(DotNetBuildSourceOnly)' == 'true'">false</NativeAotSupported>
     <NativeAotSupported Condition="$(OutputRID.StartsWith('tizen')) == 'true'">false</NativeAotSupported>
     <NativeAotSupported Condition="$(OutputRID.EndsWith('-arm')) == 'true'">false</NativeAotSupported>
     <!-- Disable native AOT on FreeBSD when cross building from Linux. -->
diff --git a/src/coreclr/tools/aot/ILCompiler/ILCompiler.props b/src/coreclr/tools/aot/ILCompiler/ILCompiler.props
index 6b419773911..70994509d40 100644
--- a/src/coreclr/tools/aot/ILCompiler/ILCompiler.props
+++ b/src/coreclr/tools/aot/ILCompiler/ILCompiler.props
@@ -47,10 +47,10 @@
     <!-- CoreDisTools are used in debugging visualizers. -->
     <IncludeCoreDisTools Condition="'$(Configuration)' != 'Release' and '$(CrossHostArch)' == ''">true</IncludeCoreDisTools>
     <!-- source-build doesn't use ObjWriter for the ILCompiler.  the end-user will end up pulling Microsoft-built bits for NativeAOT anyway.  -->
-    <IncludeObjWriter Condition="'$(DotNetBuildFromSource)' != 'true' and '$(ObjWriterVersion)' != ''">true</IncludeObjWriter>
+    <IncludeObjWriter Condition="'$(DotNetBuildSourceOnly)' != 'true' and '$(ObjWriterVersion)' != ''">true</IncludeObjWriter>
   </PropertyGroup>
 
-  <Import Project="$(RepositoryEngineeringDir)coredistools.targets" Condition="'$(DotNetBuildFromSource)' != 'true' and '$(IncludeCoreDisTools)' == 'true'" />
+  <Import Project="$(RepositoryEngineeringDir)coredistools.targets" Condition="'$(DotNetBuildSourceOnly)' != 'true' and '$(IncludeCoreDisTools)' == 'true'" />
 
   <ItemGroup>
     <PackageReference Include="runtime.$(ObjWriterRid).Microsoft.NETCore.Runtime.ObjWriter" Condition="'$(IncludeObjWriter)' == 'true'">
diff --git a/src/coreclr/tools/r2rdump/R2RDump.csproj b/src/coreclr/tools/r2rdump/R2RDump.csproj
index 103d8160d0b..3f5a93c94fb 100644
--- a/src/coreclr/tools/r2rdump/R2RDump.csproj
+++ b/src/coreclr/tools/r2rdump/R2RDump.csproj
@@ -15,7 +15,7 @@
     <RunAnalyzers>false</RunAnalyzers>
   </PropertyGroup>
 
-  <Import Project="$(RepositoryEngineeringDir)coredistools.targets" Condition="'$(DotNetBuildFromSource)' != 'true'" />
+  <Import Project="$(RepositoryEngineeringDir)coredistools.targets" Condition="'$(DotNetBuildSourceOnly)' != 'true'" />
   <Import Project="$(RepositoryEngineeringDir)DiaSymReaderNative.targets" />
 
   <ItemGroup>
diff --git a/src/installer/pkg/projects/Directory.Build.props b/src/installer/pkg/projects/Directory.Build.props
index 2917964afb8..a07b360efc0 100644
--- a/src/installer/pkg/projects/Directory.Build.props
+++ b/src/installer/pkg/projects/Directory.Build.props
@@ -35,7 +35,7 @@
     <DisableRarCache>true</DisableRarCache>
 
     <!-- During a build from source, only current-RID assets are available from upstream repos. -->
-    <RestoreAllBuildRids Condition="'$(RestoreAllBuildRids)' == '' and '$(DotNetBuildFromSource)' == 'true'">false</RestoreAllBuildRids>
+    <RestoreAllBuildRids Condition="'$(RestoreAllBuildRids)' == '' and '$(DotNetBuildSourceOnly)' == 'true'">false</RestoreAllBuildRids>
     <!--
       Normally, it is necessary to restore all RIDs so that assets are available to inspect. For
       example, the platform manifest includes data from all RIDs.
diff --git a/src/installer/pkg/sfx/Microsoft.NETCore.App/Directory.Build.props b/src/installer/pkg/sfx/Microsoft.NETCore.App/Directory.Build.props
index 6e48929f896..4a1a720cf6a 100644
--- a/src/installer/pkg/sfx/Microsoft.NETCore.App/Directory.Build.props
+++ b/src/installer/pkg/sfx/Microsoft.NETCore.App/Directory.Build.props
@@ -280,7 +280,7 @@
     <ExcludeFromClosure Include="@(NetFxReference)" />
  </ItemGroup>
 
-  <ItemGroup Condition="'$(DotNetBuildFromSource)' != 'true'">
+  <ItemGroup Condition="'$(DotNetBuildSourceOnly)' != 'true'">
     <!-- Add a reference to Microsoft.DiaSymReader.Native if one does not already exist. -->
     <PackageReference Include="Microsoft.DiaSymReader.Native"
                       Exclude="@(PackageReference)"
diff --git a/src/installer/pkg/sfx/Microsoft.NETCore.App/Microsoft.NETCore.App.Crossgen2.sfxproj b/src/installer/pkg/sfx/Microsoft.NETCore.App/Microsoft.NETCore.App.Crossgen2.sfxproj
index 599adf50086..337a0ce1ebe 100644
--- a/src/installer/pkg/sfx/Microsoft.NETCore.App/Microsoft.NETCore.App.Crossgen2.sfxproj
+++ b/src/installer/pkg/sfx/Microsoft.NETCore.App/Microsoft.NETCore.App.Crossgen2.sfxproj
@@ -12,7 +12,7 @@
     <ArchiveName>dotnet-crossgen2</ArchiveName>
     <SharedFrameworkHostFileNameOverride>crossgen2</SharedFrameworkHostFileNameOverride>
     <!-- Build this pack for any RID if building from source. Otherwise, only build select RIDs. -->
-    <RuntimeIdentifiers Condition="'$(DotNetBuildFromSource)' != 'true'">linux-x64;linux-musl-x64;linux-arm;linux-musl-arm;linux-arm64;linux-musl-arm64;freebsd-x64;freebsd-arm64;osx-x64;osx-arm64;win-x64;win-x86;win-arm64</RuntimeIdentifiers>
+    <RuntimeIdentifiers Condition="'$(DotNetBuildSourceOnly)' != 'true'">linux-x64;linux-musl-x64;linux-arm;linux-musl-arm;linux-arm64;linux-musl-arm64;freebsd-x64;freebsd-arm64;osx-x64;osx-arm64;win-x64;win-x86;win-arm64</RuntimeIdentifiers>
     <GenerateInstallers>false</GenerateInstallers>
     <HostJsonTargetPath>tools/</HostJsonTargetPath>
     <PermitDllAndExeFilesLackingFileVersion>true</PermitDllAndExeFilesLackingFileVersion>
@@ -21,7 +21,7 @@
     <!-- Publish crossgen2 as a single-file app on native-OS builds. Cross-OS NativeAOT compilation is not supported yet -->
     <NativeAotSupported Condition="'$(CrossBuild)' == 'true' and '$(TargetOS)' != '$(HostOS)'">false</NativeAotSupported>
     <!-- Can't use NativeAOT in source build yet https://github.com/dotnet/runtime/issues/66859 -->
-    <NativeAotSupported Condition="'$(DotNetBuildFromSource)' == 'true'">false</NativeAotSupported>
+    <NativeAotSupported Condition="'$(DotNetBuildSourceOnly)' == 'true'">false</NativeAotSupported>
   </PropertyGroup>
 
   <ItemGroup>
diff --git a/src/installer/pkg/sfx/Microsoft.NETCore.App/Microsoft.NETCore.App.Runtime.sfxproj b/src/installer/pkg/sfx/Microsoft.NETCore.App/Microsoft.NETCore.App.Runtime.sfxproj
index 988b59bcece..1f6b5503802 100644
--- a/src/installer/pkg/sfx/Microsoft.NETCore.App/Microsoft.NETCore.App.Runtime.sfxproj
+++ b/src/installer/pkg/sfx/Microsoft.NETCore.App/Microsoft.NETCore.App.Runtime.sfxproj
@@ -19,7 +19,7 @@
     <SkipInstallerBuild Condition="'$(BuildNativeAOTRuntimePack)' == 'true'">true</SkipInstallerBuild>
     <!-- Skip building any archives except in source-build, where the symbols archive is necessary
          for distro maintainers. It can generally be removed when https://github.com/dotnet/source-build/issues/3547 is resolved. -->
-    <SkipArchivesBuild Condition="'$(DotNetBuildFromSource)' != 'true' or '$(RuntimeFlavor)' != '$(PrimaryRuntimeFlavor)' or '$(TargetsMobile)' == 'true' or '$(BuildNativeAOTRuntimePack)' == 'true'">true</SkipArchivesBuild>
+    <SkipArchivesBuild Condition="'$(DotNetBuildSourceOnly)' != 'true' or '$(RuntimeFlavor)' != '$(PrimaryRuntimeFlavor)' or '$(TargetsMobile)' == 'true' or '$(BuildNativeAOTRuntimePack)' == 'true'">true</SkipArchivesBuild>
   </PropertyGroup>
 
   <ItemGroup>
diff --git a/src/libraries/Microsoft.Extensions.Logging.Abstractions/src/Microsoft.Extensions.Logging.Abstractions.csproj b/src/libraries/Microsoft.Extensions.Logging.Abstractions/src/Microsoft.Extensions.Logging.Abstractions.csproj
index 085cade3966..28d8bcddd18 100644
--- a/src/libraries/Microsoft.Extensions.Logging.Abstractions/src/Microsoft.Extensions.Logging.Abstractions.csproj
+++ b/src/libraries/Microsoft.Extensions.Logging.Abstractions/src/Microsoft.Extensions.Logging.Abstractions.csproj
@@ -44,7 +44,7 @@ Microsoft.Extensions.Logging.Abstractions.NullLogger</PackageDescription>
     <ProjectReference Include="..\gen\Microsoft.Extensions.Logging.Generators.Roslyn3.11.csproj"
                       ReferenceOutputAssembly="false"
                       PackAsAnalyzer="true"
-                      Condition="'$(DotNetBuildFromSource)' != 'true'" />
+                      Condition="'$(DotNetBuildSourceOnly)' != 'true'" />
     <ProjectReference Include="..\gen\Microsoft.Extensions.Logging.Generators.Roslyn4.0.csproj"
                       ReferenceOutputAssembly="false"
                       PackAsAnalyzer="true" />
diff --git a/src/libraries/Microsoft.NETCore.Platforms/src/Microsoft.NETCore.Platforms.csproj b/src/libraries/Microsoft.NETCore.Platforms/src/Microsoft.NETCore.Platforms.csproj
index 958cf0e65df..24aa038645a 100644
--- a/src/libraries/Microsoft.NETCore.Platforms/src/Microsoft.NETCore.Platforms.csproj
+++ b/src/libraries/Microsoft.NETCore.Platforms/src/Microsoft.NETCore.Platforms.csproj
@@ -23,7 +23,7 @@
   <ItemGroup>
     <AdditionalRuntimeIdentifiers Include="$(AdditionalRuntimeIdentifiers)" Imports="$(AdditionalRuntimeIdentifierParent)" />
     <!-- When building from source, ensure the RID we're building for is part of the RID graph. -->
-    <AdditionalRuntimeIdentifiers Include="$(OutputRID)" Imports="$(AdditionalRuntimeIdentifierParent)" Condition="'$(DotNetBuildFromSource)' == 'true'" />
+    <AdditionalRuntimeIdentifiers Include="$(OutputRID)" Imports="$(AdditionalRuntimeIdentifierParent)" Condition="'$(DotNetBuildSourceOnly)' == 'true'" />
   </ItemGroup>
 
   <ItemGroup>
diff --git a/src/libraries/System.Net.Quic/src/System.Net.Quic.csproj b/src/libraries/System.Net.Quic/src/System.Net.Quic.csproj
index 40351864618..16d83c57fe4 100644
--- a/src/libraries/System.Net.Quic/src/System.Net.Quic.csproj
+++ b/src/libraries/System.Net.Quic/src/System.Net.Quic.csproj
@@ -161,7 +161,7 @@
   <ItemGroup Condition="'$(TargetPlatformIdentifier)' == 'windows' and
                         '$(TargetOS)' == 'windows' and
                         ('$(TargetArchitecture)' == 'x64' or '$(TargetArchitecture)' == 'x86' or '$(TargetArchitecture)' == 'arm64') and
-                        '$(DotNetBuildFromSource)' != 'true'">
+                        '$(DotNetBuildSourceOnly)' != 'true'">
 
     <!-- Project references -->
     <PackageReference Include="runtime.win-$(TargetArchitecture).runtime.native.System.Net.MsQuic.Transport"
@@ -191,7 +191,7 @@
                           '$(TargetOS)' == 'osx' and
                           '$(TargetArchitecture)' == 'x64' and
                           '$(Configuration)' == 'Debug' and
-                          '$(DotNetBuildFromSource)' != 'true'">
+                          '$(DotNetBuildSourceOnly)' != 'true'">
       <!-- MsQuic packages do not have macOS binaries. Our transport package is only one source. -->
       <PackageReference Include="runtime.osx-$(TargetArchitecture).runtime.native.System.Net.MsQuic.Transport"
                         Version="$(SystemNetMsQuicTransportVersion)"
diff --git a/src/libraries/System.Text.Json/src/System.Text.Json.csproj b/src/libraries/System.Text.Json/src/System.Text.Json.csproj
index c95276f2db2..34fb2d13a6f 100644
--- a/src/libraries/System.Text.Json/src/System.Text.Json.csproj
+++ b/src/libraries/System.Text.Json/src/System.Text.Json.csproj
@@ -408,7 +408,7 @@ The System.Text.Json library is built-in as part of the shared framework in .NET
   </ItemGroup>
 
   <ItemGroup>
-    <ProjectReference Include="..\gen\System.Text.Json.SourceGeneration.Roslyn3.11.csproj" ReferenceOutputAssembly="false" PackAsAnalyzer="true" Condition="'$(DotNetBuildFromSource)' != 'true'" />
+    <ProjectReference Include="..\gen\System.Text.Json.SourceGeneration.Roslyn3.11.csproj" ReferenceOutputAssembly="false" PackAsAnalyzer="true" Condition="'$(DotNetBuildSourceOnly)' != 'true'" />
     <ProjectReference Include="..\gen\System.Text.Json.SourceGeneration.Roslyn4.0.csproj" ReferenceOutputAssembly="false" PackAsAnalyzer="true" />
     <ProjectReference Include="..\gen\System.Text.Json.SourceGeneration.Roslyn4.4.csproj" ReferenceOutputAssembly="false" PackAsAnalyzer="true" />
   </ItemGroup>
diff --git a/src/libraries/oob-all.proj b/src/libraries/oob-all.proj
index 07b063fab40..b8d20924522 100644
--- a/src/libraries/oob-all.proj
+++ b/src/libraries/oob-all.proj
@@ -29,7 +29,7 @@
 
     <!-- Skip these projects during source-build as they rely on external prebuilts. -->
     <ProjectReference Remove="Microsoft.Extensions.DependencyInjection.Specification.Tests\src\Microsoft.Extensions.DependencyInjection.Specification.Tests.csproj"
-                      Condition="'$(DotNetBuildFromSource)' == 'true'" />
+                      Condition="'$(DotNetBuildSourceOnly)' == 'true'" />
   </ItemGroup>
 
 </Project>
diff --git a/src/libraries/oob-src.proj b/src/libraries/oob-src.proj
index bb571ebc35f..48bc4897a26 100644
--- a/src/libraries/oob-src.proj
+++ b/src/libraries/oob-src.proj
@@ -37,7 +37,7 @@
 
     <!-- Skip these projects during source-build as they rely on external prebuilts. -->
     <ProjectReference Remove="Microsoft.Extensions.DependencyInjection.Specification.Tests\src\Microsoft.Extensions.DependencyInjection.Specification.Tests.csproj"
-                      Condition="'$(DotNetBuildFromSource)' == 'true'" />
+                      Condition="'$(DotNetBuildSourceOnly)' == 'true'" />
   </ItemGroup>
 
 </Project>
diff --git a/src/libraries/oob.proj b/src/libraries/oob.proj
index 34823cd1ba4..d49efa6e616 100644
--- a/src/libraries/oob.proj
+++ b/src/libraries/oob.proj
@@ -13,7 +13,7 @@
     <ProjectReference Include="oob-src.proj" OutputItemType="OOBAssembly" />
 
     <ProjectReference Include="apicompat\ApiCompat.proj"
-                      Condition="'$(DotNetBuildFromSource)' != 'true' and '$(ApiCompatValidateAssemblies)' != 'false'" />
+                      Condition="'$(DotNetBuildSourceOnly)' != 'true' and '$(ApiCompatValidateAssemblies)' != 'false'" />
   </ItemGroup>
 
   <ItemGroup Condition="'$(BuildTargetFramework)' != '$(NetCoreAppCurrent)' or '$(BuildTargetFramework)' == ''">
diff --git a/src/libraries/tests.proj b/src/libraries/tests.proj
index ec9b4a7706a..42afa2ece4f 100644
--- a/src/libraries/tests.proj
+++ b/src/libraries/tests.proj
@@ -99,8 +99,8 @@
     <ProjectExclusions Include="$(MSBuildThisFileDirectory)System.Transactions.Local\tests\System.Transactions.Local.Tests.csproj" />
   </ItemGroup>
 
-  <!-- Projects that won't work when DotNetBuildFromSource. -->
-  <ItemGroup Condition="'$(DotNetBuildFromSource)' == 'true'">
+  <!-- Projects that won't work when building source-only. -->
+  <ItemGroup Condition="'$(DotNetBuildSourceOnly)' == 'true'">
     <!-- Project targets an older target framework which does not get built. -->
     <ProjectExclusions Include="$(MSBuildThisFileDirectory)System.Numerics.Tensors\tests\Net8Tests\System.Numerics.Tensors.Net8.Tests.csproj" />
   </ItemGroup>
diff --git a/src/mono/nuget/mono-packages.proj b/src/mono/nuget/mono-packages.proj
index 025c6666db7..10add92c17e 100644
--- a/src/mono/nuget/mono-packages.proj
+++ b/src/mono/nuget/mono-packages.proj
@@ -30,7 +30,7 @@
     <ProjectReference Include="Microsoft.NET.Runtime.LibraryBuilder.Sdk\Microsoft.NET.Runtime.LibraryBuilder.Sdk.pkgproj" />
   </ItemGroup>
 
-  <ItemGroup Condition="'$(DotNetBuildFromSource)' != 'true'">
+  <ItemGroup Condition="'$(DotNetBuildSourceOnly)' != 'true'">
     <ProjectReference Include="Microsoft.NET.Runtime.MonoTargets.Sdk\Microsoft.NET.Runtime.MonoTargets.Sdk.pkgproj" />
   </ItemGroup>
 </Project>
diff --git a/src/tasks/WorkloadBuildTasks/WorkloadBuildTasks.csproj b/src/tasks/WorkloadBuildTasks/WorkloadBuildTasks.csproj
index 4e91a40280c..50249f07c44 100644
--- a/src/tasks/WorkloadBuildTasks/WorkloadBuildTasks.csproj
+++ b/src/tasks/WorkloadBuildTasks/WorkloadBuildTasks.csproj
@@ -2,7 +2,7 @@
   <PropertyGroup>
     <TargetFrameworks>$(NetCoreAppToolCurrent)</TargetFrameworks>
     <!-- net8.0 is only need for the internal nuget produced which isn't required for source builds -->
-    <TargetFrameworks Condition="'$(DotNetBuildFromSource)' != 'true'">$(TargetFrameworks);net8.0</TargetFrameworks>
+    <TargetFrameworks Condition="'$(DotNetBuildSourceOnly)' != 'true'">$(TargetFrameworks);net8.0</TargetFrameworks>
     <Nullable>enable</Nullable>
     <NoWarn>$(NoWarn),CA1050,CA1850</NoWarn>
   </PropertyGroup>
diff --git a/src/tasks/tasks.proj b/src/tasks/tasks.proj
index ab54991791b..504f3caad09 100644
--- a/src/tasks/tasks.proj
+++ b/src/tasks/tasks.proj
@@ -6,7 +6,7 @@
     <!-- For example, they may take dependencies on pre-built packages that aren't build-from-source. e.g. 'Microsoft.DotNet.CilStrip.Sources' -->
     <ProjectReference Remove="MonoTargetsTasks\MonoTargetsTasks.csproj;
                               MonoTargetsTasks\ILStrip\AssemblyStripper\AssemblyStripper.csproj"
-                      Condition="'$(DotNetBuildFromSource)' == 'true'" />
+                      Condition="'$(DotNetBuildSourceOnly)' == 'true'" />
   </ItemGroup>
 
   <!--
diff --git a/src/tests/Common/Directory.Build.targets b/src/tests/Common/Directory.Build.targets
index faa9d09b22a..2d447a14a1b 100644
--- a/src/tests/Common/Directory.Build.targets
+++ b/src/tests/Common/Directory.Build.targets
@@ -15,7 +15,7 @@
     <GCStressDependsOnCoreDisTools Condition="'$(TargetOS)' == 'windows' And ('$(TargetArchitecture)' == 'x64' Or '$(TargetArchitecture)' == 'x86')">true</GCStressDependsOnCoreDisTools>
     <GCStressDependsOnCoreDisTools Condition="'$(TargetOS)' == 'linux' And '$(TargetArchitecture)' == 'x64'">true</GCStressDependsOnCoreDisTools>
     <CopyCoreDisToolsToCoreRoot>false</CopyCoreDisToolsToCoreRoot>
-    <CopyCoreDisToolsToCoreRoot Condition="$(GCStressDependsOnCoreDisTools) And '$(DotNetBuildFromSource)' != 'true'">true</CopyCoreDisToolsToCoreRoot>
+    <CopyCoreDisToolsToCoreRoot Condition="$(GCStressDependsOnCoreDisTools) And '$(DotNetBuildSourceOnly)' != 'true'">true</CopyCoreDisToolsToCoreRoot>
     <!-- Non-desktop OS's use a custom dotnet host, instead of corerun -->
     <IsDesktopOS Condition="'$(TargetsBrowser)' != 'true' and '$(TargetsAndroid)' != 'true' and '$(TargetstvOS)' != 'true' and '$(TargetsiOS)' != 'true' and '$(TargetsMacCatalyst)' != 'true'">true</IsDesktopOS>
   </PropertyGroup>
diff --git a/src/tools/illink/src/ILLink.CodeFix/ILLink.CodeFixProvider.csproj b/src/tools/illink/src/ILLink.CodeFix/ILLink.CodeFixProvider.csproj
index 3771de91b84..5dd13cb7772 100644
--- a/src/tools/illink/src/ILLink.CodeFix/ILLink.CodeFixProvider.csproj
+++ b/src/tools/illink/src/ILLink.CodeFix/ILLink.CodeFixProvider.csproj
@@ -9,8 +9,8 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Condition="'$(DotNetBuildFromSource)' != 'true'" Include="Microsoft.CodeAnalysis.CSharp.Workspaces" Version="$(MicrosoftCodeAnalysisVersion_LatestVS)" PrivateAssets="all" />
-    <PackageReference Condition="'$(DotNetBuildFromSource)' == 'true'" Include="Microsoft.CodeAnalysis.CSharp.Workspaces" Version="$(MicrosoftCodeAnalysisVersion)" PrivateAssets="all" />
+    <PackageReference Condition="'$(DotNetBuildSourceOnly)' != 'true'" Include="Microsoft.CodeAnalysis.CSharp.Workspaces" Version="$(MicrosoftCodeAnalysisVersion_LatestVS)" PrivateAssets="all" />
+    <PackageReference Condition="'$(DotNetBuildSourceOnly)' == 'true'" Include="Microsoft.CodeAnalysis.CSharp.Workspaces" Version="$(MicrosoftCodeAnalysisVersion)" PrivateAssets="all" />
   </ItemGroup>
 
   <ItemGroup>
diff --git a/src/tools/illink/src/ILLink.RoslynAnalyzer/ILLink.RoslynAnalyzer.csproj b/src/tools/illink/src/ILLink.RoslynAnalyzer/ILLink.RoslynAnalyzer.csproj
index 80fd6a90220..7db05c1cde9 100644
--- a/src/tools/illink/src/ILLink.RoslynAnalyzer/ILLink.RoslynAnalyzer.csproj
+++ b/src/tools/illink/src/ILLink.RoslynAnalyzer/ILLink.RoslynAnalyzer.csproj
@@ -7,7 +7,7 @@
     <EnableXlfLocalization>false</EnableXlfLocalization>
     <EnableDefaultEmbeddedResourceItems>false</EnableDefaultEmbeddedResourceItems>
     <AnalysisLevel>Latest</AnalysisLevel>
-    <NoWarn Condition="'$(DotNetBuildFromSource)' == 'true'">$(NoWarn);CS8524</NoWarn>
+    <NoWarn Condition="'$(DotNetBuildSourceOnly)' == 'true'">$(NoWarn);CS8524</NoWarn>
     <AnalyzerLanguage>cs</AnalyzerLanguage>
   </PropertyGroup>
 
@@ -16,9 +16,9 @@
   </ItemGroup>
 
   <ItemGroup>
-    <PackageReference Condition="'$(DotNetBuildFromSource)' != 'true'" Include="Microsoft.CodeAnalysis.CSharp" Version="$(MicrosoftCodeAnalysisVersion_LatestVS)" PrivateAssets="all" />
-    <PackageReference Condition="'$(DotNetBuildFromSource)' == 'true'" Include="Microsoft.CodeAnalysis.CSharp" Version="$(MicrosoftCodeAnalysisVersion)" PrivateAssets="all" />
-    <PackageReference Condition="'$(DotNetBuildFromSource)' != 'true'" Include="StaticCs" Version="$(StaticCsVersion)">
+    <PackageReference Condition="'$(DotNetBuildSourceOnly)' != 'true'" Include="Microsoft.CodeAnalysis.CSharp" Version="$(MicrosoftCodeAnalysisVersion_LatestVS)" PrivateAssets="all" />
+    <PackageReference Condition="'$(DotNetBuildSourceOnly)' == 'true'" Include="Microsoft.CodeAnalysis.CSharp" Version="$(MicrosoftCodeAnalysisVersion)" PrivateAssets="all" />
+    <PackageReference Condition="'$(DotNetBuildSourceOnly)' != 'true'" Include="StaticCs" Version="$(StaticCsVersion)">
       <PrivateAssets>all</PrivateAssets>
       <ExcludeAssets>contentfiles</ExcludeAssets> <!-- We include our own copy of the ClosedAttribute to work in source build -->
     </PackageReference>
diff --git a/src/tools/illink/src/linker/Mono.Linker.csproj b/src/tools/illink/src/linker/Mono.Linker.csproj
index e5cdbb86c5e..d1a4bdbf057 100644
--- a/src/tools/illink/src/linker/Mono.Linker.csproj
+++ b/src/tools/illink/src/linker/Mono.Linker.csproj
@@ -15,7 +15,7 @@
     <DisablePackageBaselineValidation>true</DisablePackageBaselineValidation>
     <!-- There are currently no translations, so the satellite assemblies are a waste of space. -->
     <EnableXlfLocalization>false</EnableXlfLocalization>
-    <NoWarn Condition="'$(DotNetBuildFromSource)' == 'true'">$(NoWarn);CS8524</NoWarn>
+    <NoWarn Condition="'$(DotNetBuildSourceOnly)' == 'true'">$(NoWarn);CS8524</NoWarn>
     <ContractProject>$(MSBuildThisFileDirectory)ref\Mono.Linker.csproj</ContractProject>
     <RollForward>Major</RollForward>
     <UseAppHost>false</UseAppHost>
@@ -76,7 +76,7 @@
   </ItemGroup>
 
   <ItemGroup>
-    <PackageReference Condition="'$(DotNetBuildFromSource)' != 'true'" Include="StaticCs" Version="$(StaticCsVersion)">
+    <PackageReference Condition="'$(DotNetBuildSourceOnly)' != 'true'" Include="StaticCs" Version="$(StaticCsVersion)">
       <PrivateAssets>all</PrivateAssets>
       <ExcludeAssets>contentfiles</ExcludeAssets> <!-- We include our own copy of the ClosedAttribute to work in source build -->
     </PackageReference>
@@ -84,7 +84,7 @@
   </ItemGroup>
 
   <ItemGroup>
-    <PackageReference Include="Microsoft.CodeAnalysis.BannedApiAnalyzers" Version="$(MicrosoftCodeAnalysisBannedApiAnalyzersVersion)" Condition="'$(DotNetBuildFromSource)' != 'true'">
+    <PackageReference Include="Microsoft.CodeAnalysis.BannedApiAnalyzers" Version="$(MicrosoftCodeAnalysisBannedApiAnalyzersVersion)" Condition="'$(DotNetBuildSourceOnly)' != 'true'">
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
       <PrivateAssets>all</PrivateAssets>
     </PackageReference>