MANSFIELD — He has suffered one setback after another, but Mansfield businessman Joseph Mulkern says he’s not giving up.

Mulkern, owner of Mulkern Mechanical, wants to convert the century-old Lowney Chocolate Factory, just a short walk from the Mansfield commuter rail station, into loft apartments, but the plan stalled again recently after Town Meeting failed to draw enough voters to enact a necessary zoning change.