The owners of the Beltway Plaza Mall in Greenbelt are filling in details of plans to redevelop the 54-acre mall.

Quantum Companies plans to turn the 1980s-style mall with a sea of parking and a boxy shopping center into more of a modern mixed-use development with residential and retail interspersed with walkable outdoor areas.

The plans, being reviewed by the Greenbelt City Council, would add 2,500 apartments and condominiums, 20,000 square feet of indoor recreational space and five acres of open space while cutting the retail space back from a million to 700,000 square feet.

An earlier design also included 139 townhomes, but those have been removed.

The open space would have the most dramatic effect on the mall. Plans call for an outdoor amphitheater, a plaza, a tot lot, a splash pad and a bike path. Other options under discussion include adding senior housing, a co-op or some affordable housing as well as a shuttle to take residents to the nearby Greenbelt Metro.

Some parts of the development would have woonerf streets, a Dutch-style shared road that requires cars share the same space as people and bicycles with little signage. Newly popular in Washington, D.C., the streets force motorists to drive slowly and work together with pedestrians and bicyclists to be safe.

Anchor tenants Target, Giant and AMC Theatre would return after the redevelopment.