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.
Forest City Ratner has had $761 million in subsidies, but now wants to cut the amount it pays the city.
An Independent Budget Office report found that the ambitious rezoning is needed for future demand.
Fans of Barbra Streisand and Andrea Bocelli had the most parking at the Barclays Center, a study says.
Seven construction firms on the city's caution list worked on the Atlantic Yards project.
Empire State Deveopment will unveil the design of the building, known as B2, on Thursday night.
The T-shirts protest the renaming of the Atlantic Avenue-Pacific Street stop after the British bank.
Barclays Center officials said Tuesday they'll run a "neighborly" facility without "unruly" crowds.
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