After signing law firm Greenberg Traurig as a marquee tenant, leasing broker Flagler Real Estate Services in Coral Gables is still finding it hard to fill the remaining 70 percent of unleased space. The $306 million, 47-story tower is a week away from completion, leading a brief surge of new office space coming online in the next several months. Foram Group’s Brickell Financial Centre hasn’t signed tenants, and expects to open next year. Rilea Group’s 1450 Brickell tower is almost finished, but no tenants have signed on to make the curtain wall-designed, 35-story tower home yet. Tere Blanca, president and CEO of Blanca Commercial Real Estate, said there are opportunities, but would not discuss prospective tenants.