A national medical real estate company has purchased a building in Oakland’s FirstPark for $4.3 million, the second purchase by the company this year of a medical building leased to MaineGeneral Health.

The sale of the 20,000-square-foot building was announced Monday and was brokered by Portland-based CBRE The Boulos Co.’s Dan Greenstein and Chris Paszyc, according to a release from the firm.

Montecito Medical Operating Co., based in Nashville, Tenn., had bought the MaineGeneral Musculoskeletal Center building at 15 Enterprise Drive in Augusta in in February for $14.7 million, a deal also brokered by Greenstein and Paszyc.

Local developer Kevin Mattson, who is redeveloping the former MaineGeneral hospital building on East Chestnut Street in Augusta, previously owned the 51,000-square-foot building through his company Lot 18, LLC.

Paul Stein, chief operating officer for MaineGeneral Health, said at the time he didn’t expect the purchases to have any effect on the operation of the building.

FirstPark was built in 2001 as part of a regional economic development effort and is overseen by park Director Brad Jackson. So far, the 24 communities in Kennebec and Somerset counties that funded its creation and development have lost roughly $5.14 million in the last 15 years, according to a Kennebec Journal analysis.