BROOKLYN - Officials marked a major Brooklyn milestone today when they broke ground on the first residential building as part of the Atlantic Yards project.

The complex will be located across from the Barclays Center at Dean and Flatbush avenues. It will be 32 stories high, with half of its 363 apartments reserved for low and middle income residents.

Many have supported the new development, but others argue it will further congest the borough's downtown area.

Developer Forest City Ratner says construction will take about 20 months to complete.