Chelsea residents protest 'McMansion' additions to historic townhouse

There's trouble a'brewing on a quaint Chelsea block, and unsurprisingly, it has to do with plans to expand a 19th-century townhouse. The home in question is 334 West 20th Street, which was built in the 1830s and could receive a 21st-century expansion if its owners have their way-and neighborhood residents are trying to make sure they don't.
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