Former Federal Reserve Chairman Alan Greenspan, whose interest-rate cuts helped create what he once called “froth” in house prices, said in a speech last week that he detected “early signs of stabilization” in the housing market. Some Wall Street economists also are saying the worst may be behind us.

One BofA economist expects residential construction to pick up again in the third quarter of next year. Others think later.

Ms. Zelman, who last year correctly predicted a plunge in home-builder share prices, thinks investors who now are bidding those prices back up are way too early. Sales of new homes are unlikely to start rising again before early 2008, she says. Meanwhile, “land is going down in value daily,” she says.