After staking its claim in Washington, D.C., Douglas Elliman Realty is targeting Boston for further expansion. The firm, which announced last month that it’s opening three locations in the Metro D.C. area, now has a second office in Boston after acquiring independent real estate company Bulfinch Boston Realty, Inman reported. In doing so, Elliman will bring on board Bulfinch President Zechariah Cook along with the company’s six-person team, which has had $200 million in sales