Photo courtesy of Cushman & Wakefield

Filings with Dover officials show that prolific Manchester real estate developer Brady Sullivan Properties is under contract to purchase the sprawling former Liberty Mutual complex in that city.

And it thinks the vacant, 219.5-acre property has a future as “live-work-play” development.

The company’s filing says it plans to gut the two, mid-1990s office buildings currently on-site, while building several new structures and outdoor amenities.

One of the old office buildings, at 150 Liberty Way, would be converted first, into to 245 apartments and around 37,000 square feet of ground-floor, multi-tenant space, without substantive exterior renovations besides reworking the sidewalks and adding a few new entry points.

The other old office building, 100 Liberty Way, would see its first floor retained as office uses and its upper floors converted into apartments as a second phase totaling 252 apartments, 41,000 square feet of retail and office space and a 2,500-square-foot restaurant.

Future phases could see mixed-use, medical office, restaurant and retail buildings carved out of the campus’s woods and fields, preliminary maps filed with Dover officials show.