Halley Rise Holdings LLC wants to rearrange where offices, apartments, a hotel and parks land across four undeveloped blocks south of the Reston Town Center Metro station.

The developer filed a proffer condition amendment and development plan amendments with Fairfax County covering Blocks D, E, G and H of the Halley Rise mixed-use project, Patch reported Monday, Sept. 7. The total approved development would stay at about 4.16 million square feet.

The biggest shift: 700,000 square feet of office space would move to Block D, next to existing office buildings on Blocks A and B, creating a workplace hub along Hopper Street. Block D would hold two office-and-retail buildings over a multilevel underground parking garage, with maximum heights of 250 feet plus rooftop structures.

Block G, previously slated for much of that office space, would instead get about 450 residential units, 38,400 square feet of retail and a 200-room hotel.

Block H would carry the heaviest load: roughly 391 residential units, 800,000 square feet of office space and 108,400 square feet of retail. Buildings there could reach 425 feet, the tallest in the plan.

The filing also reshapes public spaces. A park originally planned for Block G would move to Block H as a "Neighborhood Park" near Halley Rise's northern entrance. Block H would also gain Gateway Plaza, a pedestrian-oriented "living street" flanked by ground-floor retail that could host markets and street festivals.

Halley Rise Holdings, an affiliate of Newton, Massachusetts-based WS Development, said the changes are intended in part to better connect the project to the neighboring Reston Crossing redevelopment and the Metro station. Reston Crossing is a separate mixed-use proposal by Bernstein Management Corporation along Edmund Halley Drive.

The project's first phases are already built. The Edmund at Halley Rise on Block F and The Arbor on Block C are complete, along with ground-floor tenants including Wegmans, Panera Bread and Chase Bank.

Under the proffers, at least 15 percent of residential units across Halley Rise must be workforce dwelling units. A transportation demand management program would aim to cut vehicle trips by 45 percent.

Halley Rise Holdings indicated Block D would come first. The application still needs review by the Fairfax County Planning Commission and Board of Supervisors.