SOUTH NORWALK, CONN. — CB Richard Ellis (CBRE) has completed the $24.75 million sale of a retail/office portfolio in South Norwalk. The portfolio consisted of 61,146 square feet of retail property and 24,916 square feet of office space. The portfolio was 78 percent leased at the time of the transaction. Jeffrey Dunne, Dean Matus and Matthew Innes of CBRE represented the seller, Madison Tower Main Street LLC, an entity controlled by a partnership between BlackRock and Madison Marquette, in the sale. In addition, this same team from CBRE procured the buyer, TR SONO Partners, an entity controlled by F.D. Rich Co.