Mexican housing market booming: In her busy niche of real estate brokerage, Ana Laura Pulido is doing her best business in years, enjoying a sort of Mexican style immunity from the looming U.S. housing crash. Another huge potential market is the estimated 11 million Mexicans in the U.S., who can now buy "cross-border" mortgages to pay off homes in Mexico, increasing their control over earnings they send relatives and cutting the time they need to work in the U.S. to build a future back home.