In August, Candy told us that Dallas Auction Gallery had moved out of the Design District from its longtime home at 1518 Slocum Street, into a warehouse at 2235 Monitor. Now I’ve learned that Heritage Galleries, the country’s third largest auction house (just behind Sotheby’s and Christie’s) has left its longtime high rise off of Maple Ave. and moved into Dallas Auction Gallery’s old spot on Slocum.