The landmarked Hopper-Gibbons house once hosted abolitionists John Brown and William Lloyd Garrison.
The owner plans to appeal the decision, his lawyer said.
The owner of the Hopper-Gibbons House sued the city to keep a fifth-floor addition on the building.
The owner of a Chelsea house used in the network that helped slaves escape sued the city
The Hopper-Gibbons House's owner may go to court to fight ruling from city board.
The city will hear an appeal of its order to remove the fifth floor of Chelsea's Hopper Gibbons House.
The owners of a building which once housed former slaves escaping to freedom are fighting a city order.
An illegal fifth floor on a row house, once a part of the Underground Railroad, is still standing, days after a DOB deadline.
The city has ordered the developer at a Chelsea stop on the Underground Railroad to take down illegal construction.
Local activists say a Chelsea row house once owned by Quaker abolitionists is in jeopardy.
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