Right, confiscation from private owners to use it for erection of a building no one needs is a very efficient use of land. The project will require astronomical up front expenses, will stay vacant for almost 2 decades, and have endless problems until its last day (fires, terrorist acts, issues with the structure). But who cares, it's efficiency we are talking about.
Writing from a third-tier country that welcomes nationalizations, confiscations, extortions, and all the other policies you'd approve of.