Hey kevmk! You're a neighbor of mine. I live across the river. It's neat to see someone local.

Sometimes security people do make up their own rules on the spot. Yet some buildings also do ban bikes out of safety fears. You wouldn't be rude inquiring after the actual policy. If you waited just a bit, then that one particular guard probably wouldn't even figure out that you were questioning him.

But I also like the advice about making friends with him. If he's not big enough to meet you on that, you'll be able to figure it out pretty quickly.

You're concerned about parking your bike outside. My remedy might not appeal to you, but I'll toss it out there anyway.

I ride a very cheap bike. If it gets stolen it'll be an annoyance, but no worse than that. I'll simply build another one out of the parts that I've gathered up.