Boston-based New Boston Fund Inc. has brokered leases for 97,770 square feet of office space at Watermill Center in Waltham.

Global Partners LP, a logistics and marketing company, leased 72,714 square feet; Fireman Capital Partners, a private equity investment firm, leased 17,565 square feet; and BlueSnap, a global payment service provider, leased 7,491 square feet.

New Boston was represented by Duncan Gratton, senior managing director and principal, and Kate McGovern, an associate at Cassidy Turley. David Campbell, senior managing director and principal, and Ryan Romano, assistant vice president at Cassidy Turley, represented Global Partners LP. Blue Snap and Fireman Capital Partners were represented by Cassidy Turley’s John Boyle, senior managing director and principal.

Constructed in 1984, Watermill Center is a six-story, 206,634-square-foot, Class-A office building. Existing tenants include Steinway Musical Instruments and Kahn, Litwin, Renza & Co. Ltd.

New Boston spent three months completing extensive upgrades and improvements to enhance the building’s entrance and modernize the main lobby in 2012. The work included window mullion painting, carpet replacement and new wall covering, as well as exterior plaza pavers and landscaping upgrades. New Boston also installed a new revolving door, floor tile, decorative accent lighting and an electronic building directory.