Parking proposals top Wednesday’s Planning Board agenda. A public hearing is scheduled on a request to build a parking lot for a multifamily development at 503-509 Pleasant St. The property’s former building was destroyed by a fire in January 2010, displacing dozens of residents. A separate hearing will be held on a proposal to subdivide a rear lot at 408 and 416 Main St. to expand parking for a residential development. The hearings will be held during the board’s meeting, scheduled to convene at 7 p.m. in the council chamber at City Hall.