The green space will be open to the public during daytime hours year-round, the developer said.
City school officials had been mulling a K-8 school, but locals want the site to be a middle school.
Brooklyn Community Board 8 asked the Department of Transportation to beef up their plan.
Peter Zepf was helping put together the arena's "green roof" on Tuesday.
The Barclays Center Impact Zone Alliance wants the city to plan carefully, with residents in mind.
The first New York location for Industrious will open in mid-March in Prospect Heights.
Nearly 300 units at 535 Carlton Ave. will be rented to low- and middle-income tenants.
The 6-foot-wide barrier will remain during two years of construction in Prospect Heights.
More than 300 tenants still have belongings inside the Atlantic Avenue facility, the company said.
The Empire State Development Corporation has filed an eminent domain petition in Brooklyn Supreme Court.
The mixed affordable and market-rate housing will have a "Brooklyn sensibility," the developer said.
The housing plan near the Barclays Center got a kickstart from the state, city and civic groups.
Renderings and models from five architecture firms suggest how the development could look.
Atlantic Yards currently straddles Brooklyn's Community Boards 2, 6 and 8.
Modular units started to be put in place next to the Barclays Center at Dean Street and Flatbush Avenue.
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