Historic District was listed on the National Register of Historic Places in 1980. Rezoning Historically, Downtown Brooklyn was primarily a commercial and civic center, with relatively little residential development. Housing included a few apartment buildings on Livingston Street, and seven 15-story buildings that make up the over 1,000 unit Concord Village co-op development on Adams Street, at the borders of both Brooklyn Heights and Dumbo. Since the rezoning of parts of Downtown Brooklyn in 2004 to allow for denser residential development, the area has seen the arrival of new condominium towers, townhouses, and office conversions. In all, 14,000 residential units were planned for Downtown Brooklyn at that time. A New York Sun article from November 7, 2007, reports on the arrival of Downtown Brooklyn as a 24/7 community, estimating that 35,000 residents will come to the area in the next five years. In January 2008, residents started moving into the new residential buildings, according to a New York Sun article. The New York City Department of City Planning approved another, significant rezoning for portions of Downtown Brooklyn, including the Fulton Mall area, which resulted in significant expansion of office space and ground-floor retail, such as those at City Point. The rezoning consists of "zoning map and zoning text changes, new public open spaces, pedestrian and transit improvements, urban renewal, [and] street mappings". The City Planning initiative also seeks to improve the connections between Downtown and the adjacent neighborhoods of Cobble Hill, Boerum Hill, and Fort Greene. , the rezoning of Downtown Brooklyn had caused gentrification in nearby neighborhoods. Affordable housing was created in the area after the 2004 rezoning, with 420 affordable units in 2014. The housing increase has also resulted in positive effects on other aspects of Downtown Brooklyn's economy as well, with revenues for the area's hospitality industry having tripled since 2004. Some of this gentrification was controversial, however. In 2007, the city government was to acquire the houses at 223–235 Duffield Street via eminent domain, then demolish the houses and replace them with 500 new hotel rooms, 1,000 units of mixed-income housing, more than 500,000 square feet of retail space, and at least 125,000 square feet of new office space in the area; however, only 231 Duffield Street was replaced by a hotel. Still, this caused historians to protest over the planned demolition of the historic houses because of their importance to abolitionists during the American Civil