Housing Woes in U.S. Spread Around Globe

“We know we’re already in negative equity,” said Emma Linnane, a 31-year-old university administrator.

She bought a cozy, one-bedroom apartment in the Dublin suburbs with her fiancé, Paul Colgan, in May 2006, at the peak of the market. They paid $575,000 — at least $100,000 more than it would fetch today. “I sometimes get shivers thinking about it,” Ms. Linnane said, “but I’ll let the reality hit me when I go to sell it.”