First Potomac Realty Trust, of Bethesda, an owner, manager and developer of office and business park properties in the Washington area, reported funds from operations of $13.9 million, or 23 cents per diluted share, for the third quarter, an increase of 22 percent from 2013’s third-quarter FFO of $11.4 million and 19 cents. First Potomac’s buildings were 90.6 percent leased in this year’s quarter, compared with 87.4 percent for the same period in 2013.