NEW YORK - The weakening dollar has caused many problems for consumers, but it may also be providing the fuel for one unintended - and very welcome - benefit: a rally in the struggling housing market driven by foreign investors.

For an individual or developer trying to sell a home, interested buyers are just as likely to have a place in London or Paris as they are to be new to the market.

"European investment is likely to pick up," said Mark Vitner, chief economist for Charlotte, N.C.-based Wachovia Corp. "Now is the time to come over and take advantage."

The theory goes that foreign investors step in and replace first-time home buyers who have been squeezed out of the housing market during the recent downturn. These new investors, in turn, allow homeowners to trade up to larger homes.

That will help restart owners moving up the housing ladder, a process that had been key to economic growth in recent years.

Some mortgage brokers already are seeing a boost in inquiries about buying property from overseas. Dan Green, a certified mortgage planning specialist and the author of TheMortgageReports.com, said the number of inquiries he has received from outside the United States is probably five to 10 times larger than it was a year ago.

A boost in the number of homebuyers would provide needed relief for the beleaguered housing market.

Home sale prices fell every month in 2007 through August, according to the S&P/Case-Shiller index. Existing home sales have declined for eight straight months through September, National Association of Realtors figures show.

As the housing market has plummeted, the dollar also has sunk to record lows compared with other currencies such as the euro, meaning more spendable cash in the United States.

"The dollar is on sale," said Susan Wachter, a professor of real estate at the Wharton School at the University of Pennsylvania.

Today, a foreign buyer would need only 34,100 euros to make a $50,000 down payment on a house. At the beginning of the year, the same buyer would have needed 37,920 euros to make the same down payment.

The influx of foreign investors can help set a floor for the real estate market, Green said.

Because lending guidelines have been so restricted in recent months because of rising delinquencies and defaults, it is more difficult for U.S. customers to get a home loan. First-time home buyers are especially squeezed right now, Green said, and that is where the foreigners can provide support.

For investors from countries such as Ireland, the exchange rate is providing a boost in spending power, said Phillip Hegarty, sales director for Castleroc Estates, a Dublin-based firm that works with Irish investors to buy residential and commercial real estate in the United States.

Hegarty said there is plenty of demand for investment in locations such as Chicago and New York, and often demand exceeds supply.

But New York and Chicago are not the only locations likely to provide popular options for foreign investors. Florida and California, for example, are likely to see a surge in foreign investment.

"In a market with great turmoil, the weak dollar is one factor supporting some key markets," Wachter said.

She said markets like Miami and San Francisco, which are under pressure from the U.S. slowdown, are increasingly being supported by foreign investors.