And there aren't actually any lamp-posts, that was just an example. And the parking lot is closer to 200 sq ft with 3 levels, I just don't want to give away too much information about the hide location, but suffice to say, it would be something hidden in plain sight, so it doesn't require any lifting or opening or anything, just a good geocacher eye.
The reason I posted here, is because I've never hidden a cache before, and I wanted to make sure everything is in order the first time I submit the challenge.