diff --git a/build/Microsoft.DotNet.Cli.Prepare.targets b/build/Microsoft.DotNet.Cli.Prepare.targets
index c8b6886f0..a39977cb8 100644
--- a/build/Microsoft.DotNet.Cli.Prepare.targets
+++ b/build/Microsoft.DotNet.Cli.Prepare.targets
@@ -130,9 +130,10 @@
 
   <Target Name="SetupDownloadHostAndSharedFxInputsOutputs" DependsOnTargets="Init">
     <PropertyGroup>
-      <CoreSetupBlobRootUrl>https://dotnetcli.azureedge.net/dotnet/$(CoreSetupChannel)</CoreSetupBlobRootUrl>
-      <SharedFrameworkArchiveBlobRootUrl>$(CoreSetupBlobRootUrl)/Binaries/$(SharedFrameworkVersion)</SharedFrameworkArchiveBlobRootUrl>
-      <CoreSetupInstallerBlobRootUrl>$(CoreSetupBlobRootUrl)/Installers</CoreSetupInstallerBlobRootUrl>
+      <CoreSetupBlobRootUrl>https://dotnetcli.azureedge.net/dotnet/</CoreSetupBlobRootUrl>
+      <CoreSetupBlobRootUrlWithChannel>$(CoreSetupBlobRootUrl)$(CoreSetupChannel)</CoreSetupBlobRootUrlWithChannel>
+      <SharedFrameworkArchiveBlobRootUrl>$(CoreSetupBlobRootUrlWithChannel)/Binaries/$(SharedFrameworkVersion)</SharedFrameworkArchiveBlobRootUrl>
+      <CoreSetupInstallerBlobRootUrl>$(CoreSetupBlobRootUrlWithChannel)/Installers</CoreSetupInstallerBlobRootUrl>
       <CoreSetupDownloadDirectory>$(IntermediateDirectory)/coreSetupDownload/$(SharedFrameworkVersion)</CoreSetupDownloadDirectory>
       <CombinedSharedHostAndFrameworkArchive>$(CoreSetupDownloadDirectory)/combinedSharedHostAndFrameworkArchive</CombinedSharedHostAndFrameworkArchive>
     </PropertyGroup>
@@ -166,11 +167,74 @@
         <ExtractDestintation></ExtractDestintation>
       </_DownloadAndExtractItem>
     </ItemGroup>
+
+    <!-- Additional Shared Framework to be installed -->
+    <PropertyGroup>
+      <AdditionalCoreSetupChannel>release/1.1.0</AdditionalCoreSetupChannel>
+      <AdditionalSharedFrameworkVersion>1.1.0</AdditionalSharedFrameworkVersion>
+      <AdditionalSharedHostVersion>1.1.0</AdditionalSharedHostVersion>
+      <AdditionalHostFxrVersion>1.1.0</AdditionalHostFxrVersion>
+
+      <AdditionalCoreSetupBlobRootUrlWithChannel>$(CoreSetupBlobRootUrl)$(AdditionalCoreSetupChannel)</AdditionalCoreSetupBlobRootUrlWithChannel>
+      <AdditionalSharedFrameworkArchiveBlobRootUrl>$(AdditionalCoreSetupBlobRootUrlWithChannel)/Binaries/$(AdditionalSharedFrameworkVersion)</AdditionalSharedFrameworkArchiveBlobRootUrl>
+      <AdditionalCoreSetupInstallerBlobRootUrl>$(AdditionalCoreSetupBlobRootUrlWithChannel)/Installers</AdditionalCoreSetupInstallerBlobRootUrl>
+      <AdditionalCoreSetupDownloadDirectory>$(IntermediateDirectory)/coreSetupDownload/$(AdditionalSharedFrameworkVersion)</AdditionalCoreSetupDownloadDirectory>
+      <AdditionalCombinedSharedHostAndFrameworkArchive>$(AdditionalCoreSetupDownloadDirectory)/combinedSharedHostAndFrameworkArchive</AdditionalCombinedSharedHostAndFrameworkArchive>
+
+      <!-- Additional Downloaded Installers + Archives -->
+      <AdditionalDownloadedSharedHostInstallerFileName Condition=" '$(InstallerExtension)' != '' ">dotnet-host-$(ProductMonikerRid).$(AdditionalSharedHostVersion)$(InstallerExtension)</AdditionalDownloadedSharedHostInstallerFileName>
+      <AdditionalDownloadedSharedHostInstallerFile Condition=" '$(InstallerExtension)' != '' ">$(PackagesDirectory)/$(AdditionalDownloadedSharedHostInstallerFileName)</AdditionalDownloadedSharedHostInstallerFile>
+
+      <AdditionalDownloadedHostFxrInstallerFileName Condition=" '$(InstallerExtension)' != '' ">dotnet-hostfxr-$(ProductMonikerRid).$(AdditionalHostFxrVersion)$(InstallerExtension)</AdditionalDownloadedHostFxrInstallerFileName>
+      <AdditionalDownloadedHostFxrInstallerFile Condition=" '$(InstallerExtension)' != '' ">$(PackagesDirectory)/$(AdditionalDownloadedHostFxrInstallerFileName)</AdditionalDownloadedHostFxrInstallerFile>
+
+      <AdditionalDownloadedSharedFrameworkInstallerFileName Condition=" '$(InstallerExtension)' != '' ">dotnet-sharedframework-$(ProductMonikerRid).$(AdditionalSharedFrameworkVersion)$(InstallerExtension)</AdditionalDownloadedSharedFrameworkInstallerFileName>
+      <AdditionalDownloadedSharedFrameworkInstallerFile Condition=" '$(InstallerExtension)' != '' ">$(PackagesDirectory)/$(AdditionalDownloadedSharedFrameworkInstallerFileName)</AdditionalDownloadedSharedFrameworkInstallerFile>
+
+      <AdditionalCombinedFrameworkHostCompressedFileName>dotnet-$(ProductMonikerRid).$(AdditionalSharedFrameworkVersion)$(ArchiveExtension)</AdditionalCombinedFrameworkHostCompressedFileName>
+    </PropertyGroup>
+
+    <ItemGroup>
+      <_DownloadAndExtractItem Include="AdditionalCombinedSharedHostAndFrameworkArchive"
+                               Condition="!Exists('$(AdditionalCombinedSharedHostAndFrameworkArchive)')">
+        <Url>$(AdditionalSharedFrameworkArchiveBlobRootUrl)/$(AdditionalCombinedFrameworkHostCompressedFileName)</Url>
+        <DownloadFileName>$(AdditionalCombinedSharedHostAndFrameworkArchive)</DownloadFileName>
+        <ExtractDestination>$(SharedFrameworkPublishDirectory)</ExtractDestination>
+        <!-- don't overwrite the destination because both shared fx's need to be combined -->
+        <OverwriteDestination>False</OverwriteDestination>
+      </_DownloadAndExtractItem>
+
+      <_DownloadAndExtractItem Include="AdditionalDownloadedSharedFrameworkInstallerFile"
+                               Condition="!Exists('$(AdditionalDownloadedSharedFrameworkInstallerFile)') And '$(InstallerExtension)' != ''">
+        <Url>$(AdditionalCoreSetupInstallerBlobRootUrl)/$(AdditionalSharedFrameworkVersion)/$(AdditionalDownloadedSharedFrameworkInstallerFileName)</Url>
+        <DownloadFileName>$(AdditionalDownloadedSharedFrameworkInstallerFile)</DownloadFileName>
+        <ExtractDestination></ExtractDestination>
+      </_DownloadAndExtractItem>
+
+      <_DownloadAndExtractItem Include="AdditionalDownloadedSharedHostInstallerFile"
+                               Condition="!Exists('$(AdditionalDownloadedSharedHostInstallerFile)') And '$(InstallerExtension)' != ''">
+        <Url>$(AdditionalCoreSetupInstallerBlobRootUrl)/$(AdditionalSharedHostVersion)/$(AdditionalDownloadedSharedHostInstallerFileName)</Url>
+        <DownloadFileName>$(AdditionalDownloadedSharedHostInstallerFile)</DownloadFileName>
+        <ExtractDestintation></ExtractDestintation>
+      </_DownloadAndExtractItem>
+
+      <_DownloadAndExtractItem Include="AdditionalDownloadedHostFxrInstallerFile"
+                               Condition="!Exists('$(AdditionalDownloadedHostFxrInstallerFile)') And '$(InstallerExtension)' != ''">
+        <Url>$(AdditionalCoreSetupInstallerBlobRootUrl)/$(AdditionalHostFxrVersion)/$(AdditionalDownloadedHostFxrInstallerFileName)</Url>
+        <DownloadFileName>$(AdditionalDownloadedHostFxrInstallerFile)</DownloadFileName>
+        <ExtractDestintation></ExtractDestintation>
+      </_DownloadAndExtractItem>
+    </ItemGroup>
   </Target>
 
   <Target Name="DownloadHostAndSharedFxArtifacts"
           DependsOnTargets="SetupDownloadHostAndSharedFxInputsOutputs">
 
+    <PropertyGroup>
+      <OverwriteExtractionDestination>%(_DownloadAndExtractItem.OverwriteDestination)</OverwriteExtractionDestination>
+      <OverwriteExtractionDestination Condition="'$(OverwriteExtractionDestination)' == ''">True</OverwriteExtractionDestination>
+    </PropertyGroup>
+    
     <DownloadFile Condition=" '@(_DownloadAndExtractItem)' != '' "
                   Uri="%(_DownloadAndExtractItem.Url)"
                   DestinationPath="%(_DownloadAndExtractItem.DownloadFileName)" />
@@ -178,12 +242,12 @@
     <ZipFileExtractToDirectory Condition=" '%(_DownloadAndExtractItem.ExtractDestination)' != '' AND '$(OSName)' == 'win' "
                                SourceArchive="%(_DownloadAndExtractItem.DownloadFileName)"
                                DestinationDirectory="%(_DownloadAndExtractItem.ExtractDestination)"
-                               OverwriteDestination="True" />
+                               OverwriteDestination="$(OverwriteExtractionDestination)" />
 
     <TarGzFileExtractToDirectory Condition=" '%(_DownloadAndExtractItem.ExtractDestination)' != '' AND '$(OSName)' != 'win' "
                                SourceArchive="%(_DownloadAndExtractItem.DownloadFileName)"
                                DestinationDirectory="%(_DownloadAndExtractItem.ExtractDestination)"
-                               OverwriteDestination="True" />
+                               OverwriteDestination="$(OverwriteExtractionDestination)" />
   </Target>
 
   <Target Name="RestoreSrcPackages"
@@ -218,7 +282,7 @@
 
     <CallTarget Targets="CleanToolsLockFiles" />
 
-    <DotNetRestore ToolPath="$(DotNetPath)" 
+    <DotNetRestore ToolPath="$(DotNetPath)"
                    ProjectPath="&quot;%(RestoreToolsPackagesInput.FullPath)&quot;" />
 
   </Target>
diff --git a/build_projects/dotnet-cli-build/TarGzFileExtractToDirectory.cs b/build_projects/dotnet-cli-build/TarGzFileExtractToDirectory.cs
index b2575a22e..f5d70b9a7 100644
--- a/build_projects/dotnet-cli-build/TarGzFileExtractToDirectory.cs
+++ b/build_projects/dotnet-cli-build/TarGzFileExtractToDirectory.cs
@@ -42,12 +42,6 @@ namespace Microsoft.DotNet.Build.Tasks
                     Log.LogMessage(MessageImportance.Low, "'{0}' already exists, trying to delete before unzipping...", DestinationDirectory);
                     Directory.Delete(DestinationDirectory, recursive: true);
                 }
-                else
-                {
-                    Log.LogWarning("'{0}' already exists. Did you forget to set '{1}' to true?", DestinationDirectory, nameof(OverwriteDestination));
-
-                    retVal = false;
-                }
             }
 
             if (!File.Exists(SourceArchive))
diff --git a/build_projects/dotnet-cli-build/ZipFileExtractToDirectory.cs b/build_projects/dotnet-cli-build/ZipFileExtractToDirectory.cs
index a17baf99a..aa78823f9 100644
--- a/build_projects/dotnet-cli-build/ZipFileExtractToDirectory.cs
+++ b/build_projects/dotnet-cli-build/ZipFileExtractToDirectory.cs
@@ -25,7 +25,7 @@ namespace Microsoft.DotNet.Build.Tasks
         public string DestinationDirectory { get; set; }
 
         /// <summary>
-        /// Indicates if the destination archive should be overwritten if it already exists.
+        /// Indicates if the destination directory should be cleaned if it already exists.
         /// </summary>
         public bool OverwriteDestination { get; set; }
 
@@ -40,17 +40,37 @@ namespace Microsoft.DotNet.Build.Tasks
                         Log.LogMessage(MessageImportance.Low, "'{0}' already exists, trying to delete before unzipping...", DestinationDirectory);
                         Directory.Delete(DestinationDirectory, recursive: true);
                     }
-                    else
-                    {
-                        Log.LogWarning("'{0}' already exists. Did you forget to set '{1}' to true?", DestinationDirectory, nameof(OverwriteDestination));
-                    }
                 }
 
                 Log.LogMessage(MessageImportance.High, "Decompressing '{0}' into '{1}'...", SourceArchive, DestinationDirectory);
                 if (!Directory.Exists(Path.GetDirectoryName(DestinationDirectory)))
                     Directory.CreateDirectory(Path.GetDirectoryName(DestinationDirectory));
 
-                ZipFile.ExtractToDirectory(SourceArchive, DestinationDirectory);
+                // match tar default behavior to overwrite by default
+                // Replace this code with ZipFile.ExtractToDirectory when https://github.com/dotnet/corefx/pull/14806 is available
+                using (ZipArchive archive = ZipFile.Open(SourceArchive, ZipArchiveMode.Read))
+                {
+                    DirectoryInfo di = Directory.CreateDirectory(DestinationDirectory);
+                    string destinationDirectoryFullPath = di.FullName;
+
+                    foreach (ZipArchiveEntry entry in archive.Entries)
+                    {
+                        string fileDestinationPath = Path.GetFullPath(Path.Combine(destinationDirectoryFullPath, entry.FullName));
+
+                        if (Path.GetFileName(fileDestinationPath).Length == 0)
+                        {
+                            // If it is a directory:
+                            Directory.CreateDirectory(fileDestinationPath);
+                        }
+                        else
+                        {
+                            // If it is a file:
+                            // Create containing directory:
+                            Directory.CreateDirectory(Path.GetDirectoryName(fileDestinationPath));
+                            entry.ExtractToFile(fileDestinationPath, overwrite: true);
+                        }
+                    }
+                }
             }
             catch (Exception e)
             {