The greater downtown area saw the highest dollar volume of transactions in Brooklyn during the first half of 2014, with 122 transactions netting a combined $732 million, according to the latest Brooklyn commercial sales report by brokerage and advisory firm TerraCRG. The neighborhood’s 24 development site sales during that six-month period totaled $234.9 million, which is nearly double the collective purchase figures for development sites in other areas of the borough, the report says.