After buying a Seaport District office and lab building in late 2016 and boosting occupancy to 96 percent, developer Related Beal is ready to cash out.

Related Beal has hired JLL Boston to market 27 Drydock Ave., a 289,613-square-foot complex in the Raymond L. Flynn Marine Park. One local commercial real estate source estimated the property could attract bids in the $260 million range.

Related Beal acquired the ground-leased property in December 2016 for $146.5 million, when the complex which is owned by the Economic Development and Industrial Corp. of Boston was 84 percent leased. Tenants include Dana-Farber Cancer Institute, KeraFast, Emulate, MetaStat, Gingko Bioworks, Orig3n and InviCRO.

Existing tenant leases have average remaining weighted terms of nearly eight years, according to JLL marketing materials, and existing rents that are 17 percent below the current market.

The lease holder before Related Beal, North Star Management, converted much of the building’s former warehouse space into lab and tech space as the Seaport District became a destination for high-end tenants.