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Gowanus Lounge covers the NYC Economic Development Corporation's RFP that might allow the Duffield Abolitionist homes to stand, even as they build Willoughby Square. They posted this map at
City Wants "Brooklyn Abolitionism Commemoration" Proposals, and summarized the new announcement this way:
The Underground Railroad Houses on Duffield Street in Downtown Brooklyn may eventually fall to bulldozers, but it's looking more and more likely that the city is putting up some sort of museum or other commemoration at the site or in another location.