The two quick answers are 1) contact them and agree to a settlement to pay them part or all of what you owe on the express contingency that they remove any and all negative credit information they placed on your credit report. Note I said 'remove' not 'report as having been past due and now paid'.
The 2nd option, and one that I'd suggest you try first, is to contest the legitimacy of the debt to all three of the credit reporting agencies telling them that the debt is invalid as shown and request that they investigate it. If they do not get a response from the creditor within around 30 days, then they'll remove it from your report. If the creditor (the apartment management probably) verifies the debt, then you'll need to take the settlement route. Otherwise, you wait until 2011 and it'll come off anyway.