["I have a parking spot at my job, but I don't have a car.", 'Maybe you can park a bicycle or skateboard there.', "I thought about it - but then my friend decided to park his new car there!  I'm pretty upset about it - it is my spot after all."]
Dang! Tell your friend to go find a new spot!
I had a parking spot at my job, but I didn't have a car.  Another friend decided that he would use my spot since I wasn't using it.