diff --git a/build/common.project.props b/build/common.project.props
index 2dae6391a63..85df906cddb 100644
--- a/build/common.project.props
+++ b/build/common.project.props
@@ -10,7 +10,6 @@
 
   <!-- Common -->
   <PropertyGroup>
-    <IsBuildOnlyXPLATProjects>$(DotNetBuildFromSource)</IsBuildOnlyXPLATProjects>
     <RestoreProjectStyle>PackageReference</RestoreProjectStyle>
     <NETFXTargetFrameworkVersion>v4.7.2</NETFXTargetFrameworkVersion>
     <NETFXTargetFramework>net472</NETFXTargetFramework>
@@ -18,14 +17,13 @@
     <NETCoreTargetFramework Condition="'$(DotNetBuildFromSource)' == 'true'">net6.0</NETCoreTargetFramework>
     <NETCoreTestTargetFramework>netcoreapp5.0</NETCoreTestTargetFramework>
     <NetStandardVersion>netstandard2.0</NetStandardVersion>
-    <NetStandardVersion Condition="'$(DotNetBuildFromSource)' == 'true'">net6.0</NetStandardVersion>
     <TargetFrameworksExe>$(NETFXTargetFramework);$(NETCoreTargetFramework)</TargetFrameworksExe>
-    <TargetFrameworksExe Condition="'$(IsBuildOnlyXPLATProjects)' == 'true' OR '$(IsXPlat)' == 'true'">$(NETCoreTargetFramework)</TargetFrameworksExe>
+    <TargetFrameworksExe Condition="'$(IsXPlat)' == 'true'">$(NETCoreTargetFramework)</TargetFrameworksExe>
     <TargetFrameworksExeForSigning>$(TargetFrameworksExe);netcoreapp5.0</TargetFrameworksExeForSigning>
     <TargetFrameworksExeForSigning Condition=" '$(IsXPlat)' == 'true' ">$(NETCoreTargetFramework);netcoreapp5.0</TargetFrameworksExeForSigning>
     <TargetFrameworksExeForSigning Condition="'$(DotNetBuildFromSource)' == 'true'">$(TargetFrameworksExe);net6.0</TargetFrameworksExeForSigning>
     <TargetFrameworksLibrary>$(NETFXTargetFramework);$(NetStandardVersion)</TargetFrameworksLibrary>
-    <TargetFrameworksLibrary Condition="'$(IsBuildOnlyXPLATProjects)' == 'true'">$(NetStandardVersion)</TargetFrameworksLibrary>
+    <TargetFrameworksLibrary Condition="'$(DotNetBuildFromSource)' == 'true'">$(NETCoreTargetFramework);$(NETFXTargetFramework);$(NetStandardVersion)</TargetFrameworksLibrary>
     <TargetFrameworksLibraryForSigning>$(TargetFrameworksLibrary);netcoreapp5.0</TargetFrameworksLibraryForSigning>
     <TargetFrameworksLibraryForSigning Condition="'$(DotNetBuildFromSource)' == 'true'">$(TargetFrameworksLibrary);net6.0</TargetFrameworksLibraryForSigning>
     <TargetFrameworksLibraryForCrossVerificationTests>$(NETFXTargetFramework);netcoreapp5.0</TargetFrameworksLibraryForCrossVerificationTests>
@@ -288,7 +286,7 @@
   </ItemGroup>
 
     <!-- FxCop Analyzers -->
-  <ItemGroup Condition="'$(Shipping)' == 'true' AND '$(SkipAnalyzers)' != 'true' AND '$(IsBuildOnlyXPLATProjects)' != 'true'">
+  <ItemGroup Condition="'$(Shipping)' == 'true' AND '$(SkipAnalyzers)' != 'true' AND '$(DotNetBuildFromSource)' != 'true'">
     <PackageReference Include="Microsoft.CodeAnalysis.FxCopAnalyzers">
       <PrivateAssets>all</PrivateAssets>
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
diff --git a/build/common.targets b/build/common.targets
index 0ab7d1e1600..736a9ee17b1 100644
--- a/build/common.targets
+++ b/build/common.targets
@@ -71,7 +71,7 @@
   </PropertyGroup>
 
   <!-- Projects we pack become public APIs that others can use -->
-  <PropertyGroup Condition=" '$(IsBuildOnlyXPLATProjects)' != 'true' and '$(PackProject)' == 'true' ">
+  <PropertyGroup Condition=" '$(DotNetBuildFromSource)' != 'true' and '$(PackProject)' == 'true' ">
     <UsePublicApiAnalyzer Condition=" '$(UsePublicApiAnalyzer)' == '' " >true</UsePublicApiAnalyzer>
   </PropertyGroup>
 
diff --git a/build/packages.targets b/build/packages.targets
index 6f76ae916cb..ea5e4b88f52 100644
--- a/build/packages.targets
+++ b/build/packages.targets
@@ -10,6 +10,7 @@
         <CryptographyPackagesVersion>5.0.0</CryptographyPackagesVersion>
         <NuGetCoreV2Version>2.14.0-rtm-832</NuGetCoreV2Version>
         <ProjectSystemManagedVersion>17.0.0-beta1-10402-05</ProjectSystemManagedVersion>
+        <MicrosoftExtensionsCommandLineUtilsSourcesPackageVersion Condition="'$(MicrosoftExtensionsCommandLineUtilsSourcesPackageVersion)' == ''">3.0.0-preview6.19253.5</MicrosoftExtensionsCommandLineUtilsSourcesPackageVersion>
     </PropertyGroup>
 
     <!-- Test and package versions -->
@@ -34,7 +35,7 @@
         <PackageReference Update="Microsoft.CodeAnalysis.BannedApiAnalyzers" Version="3.3.2" />
         <PackageReference Update="Microsoft.CodeAnalysis.FxCopAnalyzers" Version="2.9.8" />
         <PackageReference Update="Microsoft.DataAI.NuGetRecommender.Contracts" Version="2.1.0" />
-        <PackageReference Update="Microsoft.Extensions.CommandLineUtils" Version="1.0.1" />
+        <PackageReference Update="Microsoft.Extensions.CommandLineUtils.Sources" Version="$(MicrosoftExtensionsCommandLineUtilsSourcesPackageVersion)" />
         <PackageReference Update="Microsoft.Internal.VisualStudio.Shell.Framework" Version="$(VSFrameworkVersion)" />
         <PackageReference Update="Microsoft.SourceLink.GitHub" Version="1.0.0" />
         <PackageReference Update="Microsoft.TeamFoundationServer.ExtendedClient" Version="$(VSServicesVersion)" />
diff --git a/src/NuGet.Core/NuGet.Build.Tasks.Pack/NuGet.Build.Tasks.Pack.csproj b/src/NuGet.Core/NuGet.Build.Tasks.Pack/NuGet.Build.Tasks.Pack.csproj
index e95d23eb8a6..831968ab984 100644
--- a/src/NuGet.Core/NuGet.Build.Tasks.Pack/NuGet.Build.Tasks.Pack.csproj
+++ b/src/NuGet.Core/NuGet.Build.Tasks.Pack/NuGet.Build.Tasks.Pack.csproj
@@ -62,7 +62,7 @@
   <Target
     Name="PublishAndMergePackNupkg"
     AfterTargets="AfterBuild"
-    Condition="'$(TargetFramework)' != '' AND '$(IsXPlat)' != 'true' AND '$(IsBuildOnlyXPLATProjects)' != 'true' AND '$(BuildingInsideVisualStudio)' != 'true'">
+    Condition="'$(TargetFramework)' != '' AND '$(IsXPlat)' != 'true' AND '$(DotNetBuildFromSource)' != 'true' AND '$(BuildingInsideVisualStudio)' != 'true'">
     <MSBuild Projects="$(MSBuildProjectFullPath)" Targets="Publish;ILMergeNuGetPack" />
   </Target>
 
@@ -101,7 +101,7 @@
           DependsOnTargets="GetILMergePlatformArg;DetermineILMergeNuGetPackInputsOutputs"
           Inputs="$(PathToBuiltNuGetPack);@(BuildArtifacts)"
           Outputs="$(PathToMergedNuGetPack)"
-          Condition="'$(TargetFramework)' != '' AND '$(IsBuildOnlyXPLATProjects)' != 'true' ">
+          Condition="'$(TargetFramework)' != '' AND '$(DotNetBuildFromSource)' != 'true' ">
     <PropertyGroup>
       <ILMergeResultDir>$([System.IO.Path]::GetDirectoryName($(PathToMergedNuGetPack)))</ILMergeResultDir>
     </PropertyGroup>
@@ -202,18 +202,18 @@
   <Target Name="CreatePackNupkg">
     <PropertyGroup>
       <!-- Build from source can't use ILMerge. -->
-      <ILMergeSubpath Condition="'$(IsBuildOnlyXPLATProjects)' != 'true'">ilmerge\</ILMergeSubpath>
-      <PackagePathDir Condition="'$(TargetFramework)' == '$(NETFXTargetFramework)' AND '$(IsBuildOnlyXPLATProjects)' != 'true'">Desktop/</PackagePathDir>
+      <ILMergeSubpath Condition="'$(DotNetBuildFromSource)' != 'true'">ilmerge\</ILMergeSubpath>
+      <PackagePathDir Condition="'$(TargetFramework)' == '$(NETFXTargetFramework)'">Desktop/</PackagePathDir>
       <PackagePathDir Condition="'$(TargetFramework)' == '$(NetStandardVersion)'">CoreCLR/</PackagePathDir>
     </PropertyGroup>
     <ItemGroup>
-      <TfmSpecificPackageFile Include="$(OutputPath)\$(ILMergeSubpath)NuGet.Build.Tasks.Pack.dll" Condition="'$(IsBuildOnlyXPLATProjects)' != 'true'">
+      <TfmSpecificPackageFile Include="$(OutputPath)\$(ILMergeSubpath)NuGet.Build.Tasks.Pack.dll" Condition="'$(DotNetBuildFromSource)' != 'true'">
         <PackagePath>$(PackagePathDir)</PackagePath>
       </TfmSpecificPackageFile>
       <TfmSpecificPackageFile Include="$(OutputPath)\$(ILMergeSubpath)**\NuGet*.resources.dll">
         <PackagePath>$(PackagePathDir)</PackagePath>
       </TfmSpecificPackageFile>
-      <TfmSpecificPackageFile Include="$(OutputPath)\$(ILMergeSubpath)NuGet*.dll" Condition="'$(IsBuildOnlyXPLATProjects)' == 'true'">
+      <TfmSpecificPackageFile Include="$(OutputPath)\$(ILMergeSubpath)NuGet*.dll" Condition="'$(DotNetBuildFromSource)' == 'true'">
         <PackagePath>$(PackagePathDir)</PackagePath>
       </TfmSpecificPackageFile>
     </ItemGroup>
diff --git a/src/NuGet.Core/NuGet.CommandLine.XPlat/NuGet.CommandLine.XPlat.csproj b/src/NuGet.Core/NuGet.CommandLine.XPlat/NuGet.CommandLine.XPlat.csproj
index 21015c00abf..d34cbc0dd3d 100644
--- a/src/NuGet.Core/NuGet.CommandLine.XPlat/NuGet.CommandLine.XPlat.csproj
+++ b/src/NuGet.Core/NuGet.CommandLine.XPlat/NuGet.CommandLine.XPlat.csproj
@@ -6,7 +6,7 @@
     <Description>NuGet executable wrapper for the dotnet CLI nuget functionality.</Description>
     <TargetFrameworks>$(TargetFrameworksExeForSigning)</TargetFrameworks>
     <RuntimeIdentifier Condition=" '$(TargetFramework)' == '$(NETFXTargetFramework)' ">win7-x86</RuntimeIdentifier>
-    <NoWarn>$(NoWarn);CS1591;CS1701</NoWarn>
+    <NoWarn>$(NoWarn);CS1591;CS1701;NU5104;CA1307;CA2000</NoWarn>
     <OutputType>Exe</OutputType>
     <Shipping>true</Shipping>
     <PackProject>true</PackProject>
@@ -18,7 +18,7 @@
   </ItemGroup>
 
   <ItemGroup>
-    <PackageReference Include="Microsoft.Extensions.CommandLineUtils" />
+    <PackageReference Include="Microsoft.Extensions.CommandLineUtils.Sources" PrivateAssets="All" />
     <PackageReference Include="System.Diagnostics.Debug" />
   </ItemGroup>
 
diff --git a/src/NuGet.Core/NuGet.Common/NuGet.Common.csproj b/src/NuGet.Core/NuGet.Common/NuGet.Common.csproj
index e30a079ebf8..05c2d3598b7 100644
--- a/src/NuGet.Core/NuGet.Common/NuGet.Common.csproj
+++ b/src/NuGet.Core/NuGet.Common/NuGet.Common.csproj
@@ -5,7 +5,7 @@
   <PropertyGroup>
     <Description>Common utilities and interfaces for all NuGet libraries.</Description>
     <TargetFrameworks>$(TargetFrameworksLibrary)</TargetFrameworks>
-    <TargetFrameworks Condition="'$(IsBuildOnlyXPLATProjects)' != 'true'">$(TargetFrameworks);net45</TargetFrameworks>
+    <TargetFrameworks Condition="'$(DotNetBuildFromSource)' != 'true'">$(TargetFrameworks);net45</TargetFrameworks>
     <TargetFramework />
     <NoWarn>$(NoWarn);CS1591;CS1574</NoWarn>
     <PackProject>true</PackProject>
@@ -20,7 +20,7 @@
     <TargetFramework>$(NETFXTargetFramework)</TargetFramework>
   </PropertyGroup>
 
-  <ItemGroup Condition=" '$(TargetFramework)' == '$(NETFXTargetFramework)' or '$(TargetFramework)' == 'net45' ">
+  <ItemGroup Condition=" '$(TargetFramework)' == '$(NETFXTargetFramework)' or '$(TargetFramework)' == 'net45' " >
     <Reference Include="System.Core" />
     <Reference Include="System.IO.Compression" />
     <Reference Include="mscorlib" />
diff --git a/src/NuGet.Core/NuGet.Configuration/NuGet.Configuration.csproj b/src/NuGet.Core/NuGet.Configuration/NuGet.Configuration.csproj
index bbc5ba4808f..79ebeb791cd 100644
--- a/src/NuGet.Core/NuGet.Configuration/NuGet.Configuration.csproj
+++ b/src/NuGet.Core/NuGet.Configuration/NuGet.Configuration.csproj
@@ -6,7 +6,7 @@
     <Description>NuGet's configuration settings implementation.</Description>
     <NoWarn>$(NoWarn);CS1591</NoWarn>
     <TargetFrameworks>$(TargetFrameworksLibrary)</TargetFrameworks>
-    <TargetFrameworks Condition="'$(IsBuildOnlyXPLATProjects)' != 'true'">$(TargetFrameworks);net45</TargetFrameworks>
+    <TargetFrameworks Condition="'$(DotNetBuildFromSource)' != 'true'">$(TargetFrameworks);net45</TargetFrameworks>
     <TargetFramework />
     <PackProject>true</PackProject>
     <Shipping>true</Shipping>
@@ -23,13 +23,13 @@
     <ProjectReference Include="$(NuGetCoreSrcDirectory)NuGet.Common\NuGet.Common.csproj" />
   </ItemGroup>
 
-  <ItemGroup Condition=" '$(TargetFramework)' == '$(NETFXTargetFramework)' or '$(TargetFramework)' == 'net45' ">
+  <ItemGroup Condition=" '$(TargetFramework)' == '$(NETFXTargetFramework)' or '$(TargetFramework)' == 'net45' or '$(TargetFramework)' == 'netstandard2.0' ">
     <Reference Include="System.Security" />
     <Reference Include="System.Xml" />
     <Reference Include="System.Xml.Linq" />
   </ItemGroup>
 
-  <ItemGroup Condition=" '$(TargetFramework)' == '$(NetStandardVersion)' ">
+  <ItemGroup Condition=" '$(TargetFramework)' == '$(NetStandardVersion)' or '$(TargetFramework)' == 'net6.0' ">
     <PackageReference Include="System.Security.Cryptography.ProtectedData" />
   </ItemGroup>
 
diff --git a/src/NuGet.Core/NuGet.Frameworks/NuGet.Frameworks.csproj b/src/NuGet.Core/NuGet.Frameworks/NuGet.Frameworks.csproj
index b78b1f2ea28..88a8f7491a6 100644
--- a/src/NuGet.Core/NuGet.Frameworks/NuGet.Frameworks.csproj
+++ b/src/NuGet.Core/NuGet.Frameworks/NuGet.Frameworks.csproj
@@ -4,8 +4,7 @@
 
   <PropertyGroup>
     <Description>NuGet's understanding of target frameworks.</Description>
-    <TargetFrameworks Condition="'$(IsBuildOnlyXPLATProjects)' == 'true'">$(TargetFrameworksLibrary);netstandard2.0</TargetFrameworks>
-    <TargetFrameworks Condition="'$(IsBuildOnlyXPLATProjects)' != 'true'">$(TargetFrameworksLibrary);net40</TargetFrameworks>
+    <TargetFrameworks>$(TargetFrameworksLibrary);net40</TargetFrameworks>
     <TargetFramework />
     <NoWarn>$(NoWarn);CS1591;CS1574;CS1573</NoWarn>
     <PackProject>true</PackProject>
diff --git a/src/NuGet.Core/NuGet.PackageManagement/NuGet.PackageManagement.csproj b/src/NuGet.Core/NuGet.PackageManagement/NuGet.PackageManagement.csproj
index dfbfcaa8d56..c3da7afd4ec 100644
--- a/src/NuGet.Core/NuGet.PackageManagement/NuGet.PackageManagement.csproj
+++ b/src/NuGet.Core/NuGet.PackageManagement/NuGet.PackageManagement.csproj
@@ -35,7 +35,7 @@
     <Reference Include="System.Net.Http" />
   </ItemGroup>
 
-  <ItemGroup Condition=" '$(TargetFramework)' == '$(NetStandardVersion)' ">
+  <ItemGroup Condition=" '$(TargetFramework)' == '$(NetStandardVersion)' or '$(TargetFramework)' == 'net6.0' ">
     <PackageReference Include="System.ComponentModel.Composition" />
   </ItemGroup>
 
diff --git a/src/NuGet.Core/NuGet.Packaging.Extraction/NuGet.Packaging.Extraction.csproj b/src/NuGet.Core/NuGet.Packaging.Extraction/NuGet.Packaging.Extraction.csproj
index 18f73cf831a..de6b272a8a3 100644
--- a/src/NuGet.Core/NuGet.Packaging.Extraction/NuGet.Packaging.Extraction.csproj
+++ b/src/NuGet.Core/NuGet.Packaging.Extraction/NuGet.Packaging.Extraction.csproj
@@ -24,7 +24,7 @@
   <Target
     Name="PublishAndMergePackNupkg"
     AfterTargets="AfterBuild"
-    Condition="'$(TargetFramework)' != '' AND '$(IsXPlat)' != 'true' AND '$(IsBuildOnlyXPLATProjects)' != 'true' AND '$(BuildingInsideVisualStudio)' != 'true'">
+    Condition="'$(TargetFramework)' != '' AND '$(IsXPlat)' != 'true' AND '$(DotNetBuildFromSource)' != 'true' AND '$(BuildingInsideVisualStudio)' != 'true'">
     <MSBuild Projects="$(MSBuildProjectFullPath)" Targets="Publish;ILMergeNPE" />
   </Target>
 
diff --git a/src/NuGet.Core/NuGet.Protocol/HttpSource/HttpRequestMessageExtensions.cs b/src/NuGet.Core/NuGet.Protocol/HttpSource/HttpRequestMessageExtensions.cs
index 7c959526820..5b043e443ce 100644
--- a/src/NuGet.Core/NuGet.Protocol/HttpSource/HttpRequestMessageExtensions.cs
+++ b/src/NuGet.Core/NuGet.Protocol/HttpSource/HttpRequestMessageExtensions.cs
@@ -34,7 +34,7 @@ internal static HttpRequestMessage Clone(this HttpRequestMessage request)
                 clone.Headers.TryAddWithoutValidation(header.Key, header.Value);
             }
 
-#if NET5_0
+#if NET5_0_OR_GREATER
             var clonedOptions = (IDictionary<string, object>)clone.Options;
             foreach (var option in request.Options)
             {
@@ -118,7 +118,7 @@ public static void SetConfiguration(this HttpRequestMessage request, HttpRequest
                 throw new ArgumentNullException(nameof(configuration));
             }
 
-#if NET5_0
+#if NET5_0_OR_GREATER
             request.Options.Set(new HttpRequestOptionsKey<HttpRequestMessageConfiguration>(NuGetConfigurationKey), configuration);
 #else
             request.Properties[NuGetConfigurationKey] = configuration;
@@ -128,7 +128,7 @@ public static void SetConfiguration(this HttpRequestMessage request, HttpRequest
         private static T GetProperty<T>(this HttpRequestMessage request, string key)
         {
 
-#if NET5_0
+#if NET5_0_OR_GREATER
             if (request.Options.TryGetValue<T>(new HttpRequestOptionsKey<T>(key), out T result))
 #else
             object result;
diff --git a/src/NuGet.Core/NuGet.Protocol/HttpSource/HttpRetryHandler.cs b/src/NuGet.Core/NuGet.Protocol/HttpSource/HttpRetryHandler.cs
index dc35858204b..16acceb511a 100644
--- a/src/NuGet.Core/NuGet.Protocol/HttpSource/HttpRetryHandler.cs
+++ b/src/NuGet.Core/NuGet.Protocol/HttpSource/HttpRetryHandler.cs
@@ -113,7 +113,7 @@ public async Task<HttpResponseMessage> SendAsync(
                         headerStopwatch = new Stopwatch();
                         stopwatches.Add(headerStopwatch);
                     }
-#if NET5_0
+#if NET5_0_OR_GREATER
                     requestMessage.Options.Set(new HttpRequestOptionsKey<List<Stopwatch>>(StopwatchPropertyName), stopwatches);
 #else
                     requestMessage.Properties[StopwatchPropertyName] = stopwatches;
diff --git a/src/NuGet.Core/NuGet.Protocol/HttpSource/HttpSourceAuthenticationHandler.cs b/src/NuGet.Core/NuGet.Protocol/HttpSource/HttpSourceAuthenticationHandler.cs
index b9ab58ce734..1642a0efb4b 100644
--- a/src/NuGet.Core/NuGet.Protocol/HttpSource/HttpSourceAuthenticationHandler.cs
+++ b/src/NuGet.Core/NuGet.Protocol/HttpSource/HttpSourceAuthenticationHandler.cs
@@ -98,7 +98,7 @@ protected override async Task<HttpResponseMessage> SendAsync(HttpRequestMessage
                 {
                     List<Stopwatch> stopwatches = null;
 
-#if NET5_0
+#if NET5_0_OR_GREATER
                     if (request.Options.TryGetValue(
                         new HttpRequestOptionsKey<List<Stopwatch>>(HttpRetryHandler.StopwatchPropertyName),
                         out stopwatches))
diff --git a/src/NuGet.Core/NuGet.Versioning/NuGet.Versioning.csproj b/src/NuGet.Core/NuGet.Versioning/NuGet.Versioning.csproj
index 1802939446f..9e428e7ec4a 100644
--- a/src/NuGet.Core/NuGet.Versioning/NuGet.Versioning.csproj
+++ b/src/NuGet.Core/NuGet.Versioning/NuGet.Versioning.csproj
@@ -4,7 +4,7 @@
 
   <PropertyGroup>
     <TargetFrameworks>$(TargetFrameworksLibrary)</TargetFrameworks>
-    <TargetFrameworks Condition="'$(IsBuildOnlyXPLATProjects)' != 'true'">$(TargetFrameworks);net45</TargetFrameworks>
+    <TargetFrameworks Condition="'$(DotNetBuildFromSource)' != 'true'">$(TargetFrameworks);net45</TargetFrameworks>
     <TargetFramework />
     <Description>NuGet's implementation of Semantic Versioning.</Description>
     <PackageTags>semver;semantic versioning</PackageTags>