Fairfax County may spend $100,000 a year for help in selecting a developer and planning the reuse of a shuttered prison.

The county is on track to approve a two-year contract with Basile Baumann & Associates to assist in preparing a major part of the Laurel Hill project, which will turn parts of the 2,000-plus-acre Lorton prison into a mixed-use development of homes and stores while preserving many of the prison buildings. The contract could be extended to as many as five years.