A new report predicts New York City apartment vacancy rates will soar to more than 11% by the end of next year. The scenario, which some local housing analysts rejected, would mean a grim reckoning for landlords.

The forecast, by Ten-X Commercial, an online marketplace for real estate, said rents will slide as thousands of apartments in new buildings come on the market. It noted that the rate of job growth, a driver of the rental market, already has begun to slow.

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