Some unusual boxes will arrive in downtown Wilmington the week before Christmas — 18 shipping containers that will soon become apartment homes. The Cargo District, a mixed-use project at South 16th and Queen streets, has broken ground on a nine-apartment live-work community. The first phase of the larger Cargo District project, which will eventually include retail, a coffee shop and more homes, the live-work community will open its first apartments in March. Rent isn’t set in stone, said marketing director Jacqueline Chase, but will likely fall in the $800 to $1,200 range. “They’ll be constructed using two 20-foot containers stacked on top of each other, alongside some traditional building materials, which is where we’re going to put all the wet stuff — so the kitchen and the bathroom will be there,” Chase said. Each unit will be about 600 square feet with a parking space, balcony and small green space. Designed by Romero Architecture, the loft-style apartments will boast modern interiors with heated floors and reverse-osmosis water systems. The containers used for the homes will even keep their serial tracking numbers, allowing tenants to look up where there homes went before landing in Wilmington.