If you had wanted to keep your shares of URE, you could have just bought some different calls when you opened your short call position to form a call spread. Some brokers like Scottrade do not permit option spreads. But, no problem. Your short calls are covered by your shares according to Scottrade, but they are actually covered by your long calls according to your strategy. In this way, you just close out your call spread at options exp while still maintaining your shares position.
You can bet your boots on it. 99.9% shares will be called away. Anyway sit tight for a while, maybe the market will correct before continuing upward & you will have an opportunity to obtain shares a cheaper price in the near term.