Photo courtesy of Millennium Partners

A Boston investment firm will relocate to Millennium Partners’ Winthrop Center skyscraper after leasing 115,000 square feet in the Financial District office-residential tower.

Cambridge Assoc. is the first tenant to commit to the $1.35 billion development, which broke ground in 2020 after receiving $775 million in construction financing. The lease was first reported by The Boston Globe.

Winthrop Center is designed to become the world’s largest Passive House office building, designed by Handel Architects to use 150 percent less energy than the typical office building in Boston through the use of an airtight building envelope.

“While our work in sustainable and impact investing is valued by a large portion of our clients, it is essential that our commitment to sustainability shows up beyond investment portfolios and within the walls of our firm as well,” Cambridge Associates CEO David Druley said in a statement.

The 52-story, 691-foot tower is scheduled for completion in 2023 and will contain 812,000 square feet of office space and 321 apartments in the 510,000-square-foot residential portion.

Cambridge Assoc. has been based at 125 High St. in the Financial District since 2013, when it signed a 10.5-year lease for 170,000 square feet.

While worker occupancy in Financial District buildings remains low amid the continuing effects of the COVID-19 pandemic and Omicron variant, office leasing activity rebounded in the second half of 2021 with two consecutive quarters of positive absorption.

Many firms are opting to sign leases in newer buildings, taking advantage of the expanded range of options with the availability rate sitting at 17.9 percent at the end of 2021, according to CBRE research. Of the 20 large office tenants deciding to relocate in Boston since April 2020, 83 percent relocated to a building more recently renovated than their previous offices, CBRE said in a recent report.