Yes, if it was a convenient location for whatever I was visiting, which seems generally unlikely for shops and similar, but might be for a railway station. Bike thieves work with impunity anyway, and at least it would be out of the rain.
Of course, a multistorey car park might be a cheap location to install some 'bike hub' style secure cycle parking, which becomes somewhat more attractive.
Dutch station parking these days tends to be big multi story affairs, but they are a) staffed, b) very well lit and designed for it.
The concrete monstrosity that is the modern multi story carpark is somewhere I would try to avoid at all costs, especially if alone.
Part of the joy of cycling to somewhere is that you can park very close. If I goto the shops with a city bike, I'll park it outside each shop I goto, then move onto the next. When people take the carparking idea and apply it to cycle parking you end up with parking installed that noone uses because it's in the wrong place, and just badly designed. It always made me laugh that Canterbury had some bike parking that you couldn't actually cycle to.
For cycling to work, and not just the shops, then the standard for cycle parking can be judged more simply:
Would you lock your handbag/backpack with your phone, and/or laptop there?
if the answer to the above is no, it's not somewhere I am willing to store my bike.
J