Take care of he reflection on the flood
What is wrong?
I have placed some “BOX” outside the building
“Directional Light , SkySphere , SphereReflectionCapture , Reflection Board out side the window” in my scene
Without any other lights
Do you mean you don’t get any reflection on the floor?
Look at your material you created for your floor, check what values you have for metallic and roughness values