500 N. Michigan residential conversion officially broke ground on July 29, 2026, as Mayor Brandon Johnson, Department of Planning and Development Commissioner Ciere Boatright, and Commonwealth Development Partners launched the $162 million adaptive reuse project that will transform underused office space at 500 N. Michigan Ave. into 320 apartments, including affordable housing, along Chicago’s Magnificent Mile.

The 25-story building will be rehabilitated internally to create 256 market-rate residences and 64 affordable units, while retail and commercial tenants remain on the lower floors alongside 68 below-grade parking spaces.

City Approvals Cleared the Way in 2024

The project’s amended Planned Development zoning designation won approval from the Chicago Plan Commission and City Council in October 2024. It also draws on the city’s updated minimum floor area guidelines, which were designed to make office-to-residential conversions easier to execute in Chicago’s highest-density zoning districts, and includes a $284,282 payment under the Neighborhood Opportunity Bonus System.

Sustainability and Streetscape Upgrades

Planned improvements include a green roof, new outdoor lighting, enhanced landscaping and upgraded stair access connecting the building to lower Michigan Avenue.

One of 26 Active Conversions Downtown

The 500 N. Michigan residential conversion project is one of 26 office-to-residential conversions now underway in downtown Chicago, city officials said — more than the number of such conversions completed in the previous two decades combined. Together, the 26 projects represent $1.8 billion in investment and more than 4,000 residential units.

“Office-to-residential conversions are driving downtown investment and supporting a healthy mixed-use environment,” Boatright said, adding that the project underscores the trend in the heart of the Magnificent Mile.

Adaptive Reuse as a Housing Strategy

Chicago’s conversion wave illustrates one path cities are taking to add housing supply: repurposing vacant commercial space rather than building new. Other jurisdictions are leaning on rehabilitation and expansion of existing residential stock instead. In New York, Gov. Kathy Hochul this week broke ground on the 238-unit Kingston Housing Authority Redevelopment, which combines apartment rehabs with new senior housing as part of a $25 billion statewide housing plan. Both projects reflect a broader trend of local governments pairing zoning and financing tools to unlock new housing amid persistent affordability pressure.

Project Factsheet: 500 N. Michigan Residential Conversion

• Location: 500 N. Michigan Ave., Chicago (Magnificent Mile)
• Total investment: $162 million
• Building: 25-story former office tower
• New residential units: 320 (256 market-rate, 64 affordable)
• Parking: 68 below-grade spaces
• Zoning approval: Chicago Plan Commission and City Council, October 2024
• Neighborhood Opportunity Bonus payment: $284,282
• Developer: Commonwealth Development Partners
• City partners: Mayor Brandon Johnson, Department of Planning and Development
• Sustainability features: Green roof, upgraded landscaping and lighting, improved Michigan Avenue stair access
• Groundbreaking: July 29, 2026
• Citywide context: One of 26 active downtown office-to-residential conversions, representing $1.8 billion in investment and 4,000+ units