SANFORD — A New Hampshire development company has proposed converting a former Maine textile mill into an apartment building.

Brady Sullivan Properties of Manchester, N.H., which has done similar projects in New England, has proposed the project to the planning board in Sanford.

Councilor Bradford Littlefield tells the Journal Tribune in Biddeford the conversion project is called The Lofts at Number Four, as the property was once called the Number Four Mill. It’s expected to cost between $10 million and $12 million.

The project would house up to 140 apartments.

The 278,000 square-foot mill was built in 1919 as part of the Goodall Textile complex.