The Zagato Coupé is a one-off concept that rides on the same platform as the Z4.

BMW has unveiled a one-off concept car dubbed the Zagato Coupé at the Villa d'Este Concours d'elegance that is taking place right now in northern Italy.

Based on the regular-production Z4, BMW's latest concept is clearly recognizable as a Zagato-designed car thanks to its double-bubble roof and the Z inserts that are found in its trademark kidney-shaped radiator grille.

BMW says that most of the car's body panels were crafted by hand out of aluminum. In spite of the numerous modifications made to the body the Zagato Coupé is said to be street legal just about anywhere in the world.

"It is relatively easy to build a design study which is not intended for use on the road. Not having to meet any stipulations governing crash safety or pedestrian protection opens up a host of new avenues in terms of design," said Dr. Andrea Zagato. "The challenge lies in injecting the emotional appeal of a concept car into a road-legal machine. And we think we have succeeded in doing just that with the BMW Zagato Coupé."

The Zagato Coupé's interior is nearly identical to the one that is found in the standard Z4 coupe. The seats, the dash and the door panels are upholstered in grey leather with red accents and Zagato's signature "Z" emblem is prominently stitched in red into both headrests.

Technical details about the Zagato Coupé were not released but the concept is said to be fully functional.

BMW has unveiled a new concept car at the Villa d'Este Concours d'Elegance every year since 2008. The cars have always been one-off models that are not slated for regular production and the Zagato Coupé is no exception.

That being said, the concept likely hints at the styling direction that the next-generation Z4 will take.