One of Andover's largest proposed developments in years returns to Town Hall this week.

The Conservation Commission is scheduled to review the next phase of the proposed Commons at River Road project on Tuesday, July 14, as the 432-unit mixed-use development continues working its way through the town's approval process.

The proposal would transform the vacant office property at 100 Old River Road into a five-story apartment community with ground-floor retail, a 144,000-square-foot parking garage and public open space. About 15% of the apartments would be designated as affordable housing.

The project would also mark a milestone for Andover. It's the first major development proposed under the town's Multifamily Overlay District, which voters approved in 2024 to comply with the state's MBTA Communities law.

Tuesday's meeting focuses on environmental protections.

Earlier this year, the Conservation Commission issued an initial order of conditions after finding the project would remove nearly 29,000 square feet of pavement from the wetlands buffer zone, replacing it with landscaping and other improvements designed to reduce environmental impacts.

The development still faces several hurdles before construction can begin.

The Planning Board is continuing its review of the proposal, including traffic, site design and a special permit. During recent hearings, board members debated whether the project includes enough commercial space for a development of its size.

Developers have since expanded the retail component, saying they're targeting neighborhood-serving businesses such as a café, fitness studio or healthcare services. Some Planning Board members have argued the commercial footprint should be even larger.

The 9.6-acre property was purchased for $20 million by developers John M. Corcoran & Company and SV+ Partners, who say the project would bring new housing to a long-vacant office site.

The Conservation Commission is expected to take up the project Tuesday. Separate Planning Board hearings, including a review of the project's traffic impacts, are still ahead.