I'm assuming that the Maller's place at the mall was, in fact, attacked by Ink's crew, perhaps several times, and this was the main motivation behind Durai's push to find a more secure living environment. They obviously saw that their mall was not going to withstand many more such attacks, so they wanted in at the tower. After their attack failed there and they heard about the Colony, they devised the whole truck-bomb the Arena plan to keep Ink and the boys from coming down to their new digs and ruining the party...