A vacant lot owned by Toll Brothers is shown for sale in a housing development in Broomfield, Colorado August 12, 2009. (File Photo) REUTERS/Rick Wilking (UNITED STATES BUSINESS) WASHINGTON, Oct 20 (Reuters) – President Barack Obama’s top housing adviser expressed doubts on Tuesday that the United States could afford to extend a popular tax credit for first-time homebuyers beyond its expiration next month.

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