Officials unveiled plans for 20 mph zones, shorter pedestrian crossings and other safety upgrades.
Principal Eric Havlik said class size will increase if the proposed District 15 rezoning isn't approved.
Parents say the proposed rezoning would force kids to travel too far to school on dangerous streets.
The rezoning would affect P.S. 154, P.S. 130, P.S. 131 and P.S. 230.
The school's pre-K classroom will be used for a second-grade class, the principal announced.
Many of Park Slope's top schools need restroom upgrades, school leaders say.
Wednesday marked the kickoff for the Bartel-Pritchard Square greenmarket. P.S. 154's opens on May 19.
Windsor Terrace's two public elementary schools are at the center of neighborhood life.
Evacuees from Hurricane Sandy were sent to 15 remaining shelters around the city.
A new farmers market debuts in Windsor Terrace weeks after the area's only supermarket closed.
The Key Food on Prospect Avenue and 11th Avenue will be replace by a Walgreens.
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