MRA Group to Redevelop DuPontâs Delaware Lab Campus After completing a partial sale-leaseback, the firm plans to reposition the unoccupied buildings into a premier life sciences complex. Dec302020 Image courtesy of MRA Group MRA Group announced it has signed a letter of intent to acquire the Chestnut Run Laboratory campus, a collection of lab buildings within DuPontâs 220-acre corporate headquarters complex in Wilmington, Del. MRA will purchase the 800,000-square-foot segment in a partial sale-leaseback transaction, with plans to redevelop the site. Neither MRA nor DuPont has disclosed the sale price. The agreement comes several months after DuPontâs deal for Delle Donne & Associates to acquire the lab portion of the property for redevelopment unraveled.