I'm not sure about the deletion part and certainly don't want you to have any problems with your game , however , there is this mod by Mootilda
http://www.modthesims.info/download.php?t=420924 which will allow you to add additional shopping districts , downtowns etc. I use it as part of Meetme2theriver's cleaned hood templates , works great. If you can't get an answer that leaves you feeling completely worry free , this is a good option. Good luck and happy simming!