diff --git a/Directory.Build.props b/Directory.Build.props
index d9c69c2289..ba813d12b1 100644
--- a/Directory.Build.props
+++ b/Directory.Build.props
@@ -1,4 +1,8 @@
 <Project>
+  <Import
+    Project="$([MSBuild]::GetDirectoryNameOfFileAbove($(MSBuildThisFileDirectory), AspNetCoreSettings.props))\AspNetCoreSettings.props"
+    Condition=" '$(CI)' != 'true' AND '$([MSBuild]::GetDirectoryNameOfFileAbove($(MSBuildThisFileDirectory), AspNetCoreSettings.props))' != '' " />
+
   <Import Project="version.props" />
   <Import Project="build\dependencies.props" />
 
diff --git a/korebuild-lock.txt b/korebuild-lock.txt
index 45463cc71e..95f4613014 100644
--- a/korebuild-lock.txt
+++ b/korebuild-lock.txt
@@ -1,2 +1,2 @@
-version:2.1.0-preview1-15549
-commithash:f570e08585fec510dd60cd4bfe8795388b757a95
+version:2.1.0-preview1-15567
+commithash:903e3104807b1bb8cddd28bdef205b1e2dc021d1
diff --git a/samples/SampleDestination/SampleDestination.csproj b/samples/SampleDestination/SampleDestination.csproj
index 04f291ebc3..b8e59ede3a 100644
--- a/samples/SampleDestination/SampleDestination.csproj
+++ b/samples/SampleDestination/SampleDestination.csproj
@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk.Web">
 
   <PropertyGroup>
-    <TargetFrameworks>net461;netcoreapp2.0</TargetFrameworks>
+    <TargetFrameworks>netcoreapp2.1;net461</TargetFrameworks>
   </PropertyGroup>
 
   <ItemGroup>
diff --git a/samples/SampleOrigin/SampleOrigin.csproj b/samples/SampleOrigin/SampleOrigin.csproj
index df002ec46b..b43f880f9c 100644
--- a/samples/SampleOrigin/SampleOrigin.csproj
+++ b/samples/SampleOrigin/SampleOrigin.csproj
@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk.Web">
 
   <PropertyGroup>
-    <TargetFrameworks>net461;netcoreapp2.0</TargetFrameworks>
+    <TargetFrameworks>netcoreapp2.1;net461</TargetFrameworks>
   </PropertyGroup>
 
   <ItemGroup>
diff --git a/test/Directory.Build.props b/test/Directory.Build.props
index 4f07cbc45d..4244624987 100644
--- a/test/Directory.Build.props
+++ b/test/Directory.Build.props
@@ -1,6 +1,13 @@
 <Project>
   <Import Project="..\Directory.Build.props" />
 
+  <PropertyGroup>
+    <DeveloperBuildTestTfms>netcoreapp2.1</DeveloperBuildTestTfms>
+    <StandardTestTfms>$(DeveloperBuildTestTfms)</StandardTestTfms>
+    <StandardTestTfms Condition=" '$(DeveloperBuild)' != 'true' ">$(StandardTestTfms);netcoreapp2.0</StandardTestTfms>
+    <StandardTestTfms Condition=" '$(DeveloperBuild)' != 'true' AND '$(OS)' == 'Windows_NT' ">$(StandardTestTfms);net461</StandardTestTfms>
+  </PropertyGroup>
+
   <ItemGroup>
     <PackageReference Include="Internal.AspNetCore.Sdk" PrivateAssets="All" Version="$(InternalAspNetCoreSdkPackageVersion)" />
   </ItemGroup>
diff --git a/test/Microsoft.AspNetCore.Cors.Test/Microsoft.AspNetCore.Cors.Test.csproj b/test/Microsoft.AspNetCore.Cors.Test/Microsoft.AspNetCore.Cors.Test.csproj
index 94fd991fc6..ff45928446 100644
--- a/test/Microsoft.AspNetCore.Cors.Test/Microsoft.AspNetCore.Cors.Test.csproj
+++ b/test/Microsoft.AspNetCore.Cors.Test/Microsoft.AspNetCore.Cors.Test.csproj
@@ -1,8 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFrameworks>netcoreapp2.0;net461</TargetFrameworks>
-    <TargetFrameworks Condition=" '$(OS)' != 'Windows_NT' ">netcoreapp2.0</TargetFrameworks>
+    <TargetFrameworks>$(StandardTestTfms)</TargetFrameworks>
   </PropertyGroup>
 
   <ItemGroup>
diff --git a/test/WebSites/CorsMiddlewareWebSite/CorsMiddlewareWebSite.csproj b/test/WebSites/CorsMiddlewareWebSite/CorsMiddlewareWebSite.csproj
index b5f207f78d..bd2ea479be 100644
--- a/test/WebSites/CorsMiddlewareWebSite/CorsMiddlewareWebSite.csproj
+++ b/test/WebSites/CorsMiddlewareWebSite/CorsMiddlewareWebSite.csproj
@@ -1,8 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk.Web">
 
   <PropertyGroup>
-    <TargetFrameworks>netcoreapp2.0;net461</TargetFrameworks>
-    <TargetFrameworks Condition=" '$(OS)' != 'Windows_NT' ">netcoreapp2.0</TargetFrameworks>
+    <TargetFrameworks>$(StandardTestTfms)</TargetFrameworks>
   </PropertyGroup>
 
   <ItemGroup>