And while there are tentative signs that the worst of the overall housing slump may be easing as builders cut back and interest rates remain relatively modest, condo markets continue to suffer.

Take the owner trying to sell a spacious two-bedroom condo for $879,000 in the former Columbia Hospital for Women, which closed in 2002, in the Foggy Bottom neighborhood of Washington. In 2004, the investor was so confident that he would make a handsome resale profit that he told his agent, Thomas P. Murphy, he wanted to buy five condos. Mr. Murphy said he flatly told his client he would only assist him in purchasing one unit in any one building.

“He needs $890,000 to break even, but the offers are at $800,000 to $840,000,” Mr. Murphy said. “He does remember that I told him he was not getting five of them.”

Could he rent the condo? Yes, but that option is not appealing, either. Mr. Murphy estimates that the unit could rent for $4,000 a month, far short of the $6,800 a month the condo costs in mortgage interest, maintenance fees, insurance and taxes.

“They have a choice of how they want to lose it,” Mr. Murphy said of investors and condo developers. “Drip by drip or in one slap.”

Mr. Murphy said he believed condo sales had picked up somewhat lately and he even ran a four-way bidding contest on one well-priced condo in Foggy Bottom, near the State Department. But the supply of newly built condos is so large and so many of them are similar to each other that many sellers are having to sharply cut their asking price. Others have simply given up.

At the end of 2006, 24,200 units were on the market in the Washington area, up from 13,000 at the start of 2005. Sales have slowed to 663 in the fourth quarter of 2006 from 3,520 in the first quarter of 2005, according to Delta Associates. Recorded prices have been flat, which probably masks an effective decline since only the most attractive properties are selling and many owners throw in extra inducements that do not show up in official figures.