Rainbow Row continues to grow and expand beyond the original row, traditionally defined as buildings on the west side of East Bay Street between Trad and Elliott streets.  There are more colorful structures to the north and south these days. They are even beginning to transform buildings on Tradd Street to the west! “Color is contagious,” said Kirstopher King, executive director of the Preservation Society of Charleston to the Post & Courier.  Rainbow Row is a relatively recent phenomenon, dating…