San Francisco-based Spear Street Capital has sold its 260,000-square-foot Summer Street office portfolio in Boston’s Fort Point Channel neighborhood to RREEF, an affiliate of Deutsche Bank Group, for $94.9 million.

RREEF, which has local offices in Westborough, paid $60 million for the eight-story, 165,000-square-foot 281 Summer St. and $34.9 million for the nine-story, 95,000-square-foot 321 Summer St., according to the Suffolk County Registry of Deeds.

Spear Street Capital acquired the century-old buildings for $53 million in March 2012 from Normandy Real Estate Partners. Spear Street installed new lobbies, utilities and bathrooms and hired Cassidy Turley as its leasing agent.

New tenants at 281 Summer St. in the past two years include Tibco Software Inc., which took 40,000 square feet on two floors, and McGraw Hill Global Education, which leased the 20,000-square-foot top floor.