From the resort website:

With Donald J. Trump and legendary architect Gil Hanse at the helm, the historic Blue Monster Course has undergone a complete redesign and has become a new golf course thus reaffirming its reputation as one of the most challenging and spectacular golf courses in existence. 

Already renowned the world over and rich with history, the famous Blue Monster at Trump National Doral is tougher, significantly longer, and more dramatic than ever before. Restored to its past grandeur in mid-2014 thanks to the vision of Doral's owner Donald J. Trump who acquired the hottest golf course architect, Gil Hanse, to meticulously re-sculpt every hole. The 7,590 yard course features a series of strategically placed deep bunkers, long flowing fairways, interesting undulating greens, deep Bermuda rough and a challenging assortment of water hazards – all of which combine for a course that requires both length and finesse to score well.

The famous 18th hole is traditionally ranked as one of the most difficult on the PGA Tour. It is no surprise that virtually every great name in golf has had a moment of personal triumph on this world-class course (Jack Nicklaus won twice, Greg Norman three times and Tiger Woods four).Nor is it any surprise that it has once again secured its status as the current and future home to the World Golf Championships– Cadillac Championship.