The number of homes for sale was on the rise again in April, according to figures from Zip Realty, a California-based real estate broker. Nationally, inventories expanded 3.5% last month in the 29 major markets that the company tracks, and were up 6% over the same period last year. "Inventories in some cities may be topping out," said Michael Larson, a real estate analyst with Weiss Research. "But this shows that sales are still weak." Even some markets that used to be considered bulletproof have seen inventories grow.

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