For a car dealership, what is the fixed factor of production that defines the short run.

I think this is the building. Is that correct?

3 answers

First, "college" is NOT your school subject.

I'd include all of the expenses of the building -- utilities, rent or mortgage payments, and taxes.
Oops. Didn't even look at the subject. Thanks or pointing that out :-)
I would go with size of car lot, that defines the numbers of cars one can sell.