This one of the reasons I bought a house and not a condo... I don't like being told what to do! So you have insurance and does the insurance company know that your dog is a pitbull? I don't know much about the new law in Maryland, but it definately seems unfair to you, I hope you look into getting a lawyer of your own...
if maybe you could get a temperament test done(a lot of places in Georgia now require it before moving in for any type of dog) and I would add the dog to your insurance policy regardless