According to CB Richard Ellis/The Boulos Company, Atlantic National Holdings has purchased 25 Preble St. The 32,000 s/f building was constructed in 1998 and was purchased in 1996 by Canal Congress, LLC (a division of Guggenheim Real Estate) as a part of a 7-building portfolio.   The seller hired Gregory Boulos of CBRE/Boulos to locate a buyer for the property shortly after they purchased the larger portfolio. The transaction was brokered on behalf of the buyer by Frank O'Connor, CCIM, SIOR of NAI / The Dunham Group and on behalf of the seller by Gregory Boulos.