WASHINGTON — A House committee chairman made clear at a hearing on Monday that it may take Congress years to determine whether to amend a nearly 100-year-old law to allow the District of Columbia to raise the heights of some buildings to accommodate increased growth and obtain more tax revenue.

"I'm not done looking at this. I'm not done listening and reading," Darrell Issa, R-Calif., chairman of the House Oversight and Government Reform Committee said at the end of a hearing on the issue.

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