Colliers Meredith & Grew has brokered the following transactions. *Boathouse Group, Inc. has executed a 14,237 s/f office lease for its headquarters at 48 Woerd Ave. The Colliers M&G team of John Carroll, Elias Demakes and John Dolan represented Boathouse Grp. The landlord, Intercontinental Real Estate, was represented in-house by Scott Kelly. *H&R Block Inc. has executed a new 16,901 s/f lease to relocate its office from Cambridge to 170 Lexington Rd. in Billerica.  The move is planned for early Fall. Matthew Daniels, Christopher Lawrence and Andrew Whipple of Colliers M&G represented both H&R Block and CrossHarbor Capital Partners LLC, the landlord. *Semprus Biosciences has executed a new 9,681 s/f lease to relocate and expand its headquarters to One Kendall Sq. Cambridge. Colliers M&G's Tucker Hansen represented Semprus Biosciences, working with Robert Doherty of The Beal Cos., the landlord.  Doherty was assisted by Duncan Gratton and Kimberly Roop of DTZ FHO Partners. *Altra Industrial Motion, Inc. has executed a 13,804 s/f office lease to relocate its headquarters to 300 Granite St. in Braintree.   Carroll, David Goodhue and Dolan represented Altra Industrial Motion. The landlord, Sun Life Assurance Co. of Canada, was represented by J.P. Plunkett of C&W. *Start-up DynamicOps has executed a 3,281 s/f office sublease for its headquarters at 20 Burlington Mall Rd. in Burlington. Carroll, Demakes and Dolan III represented DynamicOps, working directly with the sublandlord, First American Title Insurance. *Koko Fitness, Inc. has executed a 5,138 s/f office lease to relocate its headquarters to 300 Ledgewood Place in Rockland. The Colliers M&G team of James Elcock, David Goodhue represented the landlord, F.P. Giglio Enterprises.  Koko Fitness was represented Thomas Kent of DTZ FHO Partners.