Thanks to everybody that has contributed to this solution. I work on MacOS. I downloaded: **tools_r25.2.5-macosx.zip** from the link provided above AND NOT: **sdk-tools-darwin-3859397.zip** that is found at https://developer.android.com/studio/index.html today (Aug 13, 2017).
Unity should have been providing this solution at the **Getting started with Android development page** (https://docs.unity3d.com/Manual/android-GettingStarted.html)
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