McCain's response to the original question was the most correct, reasonable one he could give, referring the reporters to his staff for the details. Cindy is a lot wealthier than he and apparently owns a number of condos, possibly under various arrangements, maybe including partnerships or LLCs. If McCain had tried to give a simple answer to what's really a fairly complex legal question, including the issue of "ownership," he was almost sure to get some details wrong and be accused of lying. Hence, the referral to staff people who could give an accurate answer was the right thing to do.
McCain himself dows not own any of the properties.
http://www.politico.com/news/stories/0808/12700.html