athenahealth (ATHN) updates its financial outlook, reafirming FY12 guidance but issuing a mixed bag for FY13. It now forecasts an EPS of between $1.15 - 1.25, below Street estimates of $1.28. Separately, the company announces the acquisition of the Watertown "Arsenal on the Charles," an expansive, 29 acre, multi-building, commercial property situated on the Charles River, from Harvard University. The purchase is expected to close in Q2 of 2013. Shares -1% AH.