Real estate experts in Mexico worry that the enormous resonance they hear is the softening U.S. housing souk sucking money Americans have poured into vacation homes south of the boundary.

But neither the cooling U.S. housing market nor stressed Mexican presidential politics so far has stemmed the arrival of foreign dollars into Mexico's thriving coastal alternative areas, government and real estate officials said.

Mexico's tourism expansion group, put the first phase of its latest Pacific Coast resort, Litibu, on the marketplace a few months ago, buyers snapped up the 500 acres for $125 million. Foreign asset into Mexico is on way to hit $20 billion this year, up since $17.6 billion in 2005, according to the management.