Changes in the way we work and live are leaving corporate campuses that once housed headquarters as hulking relics, not unlike shopping malls across the U.S., according to a fascinating new article on Marketwatch.

“People have different lifestyles. Millennials don’t want to start their life in the suburbs,” said Dirk Lohan, the architect who designed the 74-acre McDonald’s campus and the 150-acre Ameritech campus later occupied by AT&T in Hoffman Estates in Illinois.

Alternative plans are beginning to take shape at several suburban properties. In Hoffman Estates, Somerset Development of New Jersey has outlined plans to convert the AT&T campus into a self-contained “city” using the existing buildings for 1.2 million square feet of offices, 60,000 square feet of retail shops and 80,000 square feet of conference space, while new construction would add 375 apartments, 175 townhouses and maybe a 200-room hotel.

A similar future is planned for the former Motorola Solutions campus to be a virtually self-contained community of offices, homes, stores, restaurants, hotels and entertainment venues on 225 acres. A proposal has been submitted for a Topgolf sports entertainment facility. Developers are working on a loft-style apartment building as well as plans for owner-occupied row homes, a senior housing facility and a medical office building.