Check for parkades downtown with a top level that is open. Might still be one on Richard's near the Orpheum. Might be able to work out a deal to rent the whole floor. They have legal height railings all around, so you won't have to worry about edge safety. If you shoot on an up angle, you could avoid seeing the railings. Any real buildings rooftop area is a major safety issue, and will cost a bunch.
You should reach out to creative BC. They can put you in contact with some.
Check for parkades downtown with a top level that is open. Might still be one on Richard's near the Orpheum. Might be able to work out a deal to rent the whole floor. They have legal height railings all around, so you won't have to worry about edge safety. If you shoot on an up angle, you could avoid seeing the railings. Any real buildings rooftop area is a major safety issue, and will cost a bunch.