WATERTOWN, MA-In what is reportedly the Boston market’s largest user-buyer CRE deal thus far in 2013, athenahealth Inc. has closed on its acquisition of the 11-building Arsenal on the Charles complex here. The provider of electronic record and billing systems to the healthcare sector paid $168.5 million to acquire the 760,000-square-foot complex from Harvard University in a deal originally announced this past December.

athenahealth originally moved into the Arsenal with a 133,000-square-foot headquarters space in 2005. It had become the largest tenant there at 250,000 square feet before agreeing to buy it from Harvard, which in turn had paid $162.6 million from O’Neill Properties Group in 2001, originally with the intent of redeveloping it for university use. The complex’s new owners are looking to expand to as much as 500,000 square feet there.

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