SL Green Realty Corp. is selling its 16 Court Street office building in Downtown Brooklyn to real estate investment firm CIM Group for $171 million, SL Green announced today.

CIM is expected to close on the acquisition of the 36-story, 317,600-square-foot Montague-Court Building, located between Montague and Remsen Streets near Brooklyn Borough Hall, in the fourth quarter of this year. SL Green said the deal will generate net cash proceeds of approximately $164 million for the city’s largest commercial landlord.

The real estate investment trust acquired 16 Court Street for $107.5 million in 2007 through a joint venture with the Fisher Brothers– and Morgan Stanley-backed City Investment Fund, and subsequently obtained full ownership of the property in 2013.

The office building is presently 94 percent occupied, SL Green said in a release announcing the deal, citing the benefits of a “strategic repositioning plan,” which included a lobby renovation and elevator upgrade as well as other improvements “designed to attract new tenants and enhance the building’s profile.” Current office tenants include the New York City Department of Health and Mental Hygiene, legal business services provider Blumberg Excelsior and landscape architecture firm Michael Van Valkenburgh Associates.

“This transaction underscores SL Green’s strong track record of identifying and unlocking value in New York City office buildings,” Isaac Zion, the REIT’s co-chief investment officer, said in the release. “We foresaw the demand for revitalized office product in Downtown Brooklyn and are very pleased with the successful execution of our business plan.”

A spokesman for CIM Group declined to comment. The Los Angeles-based company is best known in New York City as the developer of 432 Park Avenue, the supertall luxury residential condominium tower it built with Macklowe Properties.