All I can say is - good luck!
I know that some apartments will lift the breed restriction if you prove your dog isn't 'vicious.' Some will just require a CGC, but others can be a bit more difficult.
I heard of someone making a video of how well behaved their GSD was. Not just tricks and cute things, but out on the town, how friendly they are with strangers, video of them with kids, etc. Also, take a little notepad with you and ask people who meet your dog to sign it if they agree that he's friendly.
It's worth a shot.
Ozzy - Chocolate Pom
-Fastest 2012/2013 U-FLI Pomeranian
"In a perfect world, every dog would have a home and every home would have a dog."