diff --git a/src/libraries/Directory.Build.targets b/src/libraries/Directory.Build.targets
index 0efc8a53b0aca2..cad6c2ed4803af 100644
--- a/src/libraries/Directory.Build.targets
+++ b/src/libraries/Directory.Build.targets
@@ -2,13 +2,6 @@
   <PropertyGroup>
     <RefPath>$([MSBuild]::NormalizeDirectory('$(RefRootPath)', '$(TargetFramework)'))</RefPath>  
   </PropertyGroup>
-  
-  <PropertyGroup>
-    <CoreCLRTargetOS Condition="'$(CoreCLRTargetOS)' == ''">$(TargetOS)</CoreCLRTargetOS>
-    <CoreCLRConfiguration Condition="'$(CoreCLRConfiguration)' == ''">$(Configuration)</CoreCLRConfiguration>
-    <MonoTargetOS Condition="'$(MonoTargetOS)' == ''">$(TargetOS)</MonoTargetOS>
-    <MonoConfiguration Condition="'$(MonoConfiguration)' == ''">$(Configuration)</MonoConfiguration>
-  </PropertyGroup>
 
   <Import Project="..\..\Directory.Build.targets" />
 
diff --git a/src/libraries/restore/runtime/runtime.depproj b/src/libraries/restore/runtime/runtime.depproj
index 827dec91df7da0..c89e37e8c77b20 100644
--- a/src/libraries/restore/runtime/runtime.depproj
+++ b/src/libraries/restore/runtime/runtime.depproj
@@ -5,10 +5,6 @@
     <RuntimeIdentifier Condition="'$(RuntimeOS)' == 'webassembly' or '$(RuntimeOS)' == 'ios' or '$(RuntimeOS)' == 'android'">$(ToolRuntimeRID)</RuntimeIdentifier>
     <NoWarn>$(NoWarn);NU1603;NU1605</NoWarn>
     <SwapNativeForIL Condition="'$(SwapNativeForIL)' == '' and ('$(Configuration)' == 'Debug' or '$(Coverage)' == 'true') and '$(RuntimeFlavor)' != 'Mono'">true</SwapNativeForIL>
-    <CoreCLRTargetOS Condition="'$(CoreCLRTargetOS)' == ''">$(TargetOS)</CoreCLRTargetOS>
-    <CoreCLRConfiguration Condition="'$(CoreCLRConfiguration)' == ''">$(Configuration)</CoreCLRConfiguration>
-    <MonoTargetOS Condition="'$(MonoTargetOS)' == ''">$(TargetOS)</MonoTargetOS>
-    <MonoConfiguration Condition="'$(MonoConfiguration)' == ''">$(Configuration)</MonoConfiguration>
     <BinPlaceForTargetVertical>false</BinPlaceForTargetVertical>
     <TargetFrameworks>netcoreapp3.0-Windows_NT;netcoreapp3.0-Unix;$(netcoreappCurrent)-Windows_NT;$(netcoreappCurrent)-Unix</TargetFrameworks>
   </PropertyGroup>
diff --git a/src/libraries/shims/manual/Directory.Build.props b/src/libraries/shims/manual/Directory.Build.props
index 3b6d8565f47996..e227dbfe58c938 100644
--- a/src/libraries/shims/manual/Directory.Build.props
+++ b/src/libraries/shims/manual/Directory.Build.props
@@ -13,8 +13,6 @@
     <IsRuntimeAssembly>true</IsRuntimeAssembly>
     <BaseIntermediateOutputPath>$([MSBuild]::NormalizeDirectory('$(ArtifactsObjDir)', '$(OutDirName)'))</BaseIntermediateOutputPath>
     <IntermediateOutputPath>$(BaseIntermediateOutputPath)$(TargetFramework)-$(Configuration)</IntermediateOutputPath>
-    <CoreCLRTargetOS>$(TargetOS)</CoreCLRTargetOS>
-    <MonoTargetOS>$(TargetOS)</MonoTargetOS>
     <TargetFrameworks>$(NetCoreAppCurrent)</TargetFrameworks>
   </PropertyGroup>