Fairlane Properties Inc. recently purchased a two-building, 26-acre, 205,000-square-foot office/R&D/manufacturing business park in Boxborough for $18.3 million.

The properties at 155 and 159 Swanson Road are both two-story, red-brick buildings located at the intersection of Interstate 495 and Route 111, just one exit south of the I-495/Route 2 intersection. Both are fully leased on a long-term basis to Setra Systems Inc. and SynQor Inc.

Middlesex Savings Bank provided financing of $13.2 million for the purchase. Fairlane Properties Inc. said it raised $5.9 million in a private equity placement with numerous local investors.