Some examples from The Hague, the Netherlands:
The Malietoren (75 m / 20 floors)
http://www.bezuidenhout.nl/html/malietoren.html
Regus, a smaller officebuilding.
FaceMePLS / Flickr
The building in front is called 'Haagse Poort', behind it other buildings which are constructed above the highway are visible.
http://www.denhaag.nl/smartsite.html?id=50292
Bosch-Parkhaus (parking deck) above the A8 motorway in Stuttgart, Germany
_darklight / Flickr
Stadttor (citygate), Düsseldorf, Germany.
http://www.baukunst-nrw.de/en/index.php?oid=290