One of Tommy's bodyguards, Mike, was supposed to destroy the store initially. However, Mike messed up the fuses and the cops are getting suspicious. Tommy must go with Lance, disguised as cops, to destroy the store themselves.
Attract some police attention by running over or killing random pedestrians (there are many ways to attract police attention, but this is the easiest and safest way). Once you get one or two stars, drive to a garage where you can lure some cops in. Once you get to cops in, the garage door will close and Tommy and Lance will be disguised as cops once the garage door opens. After this, you will no longer have a wanted level. After this, get a cop car to the North Point Mall. It should be extremely easy to steal a cop car, because the cops don't arrest you since they think you are a cop. You can kill them to obtain a police car if you want. Once you get to the coffee shop, stand in a pink marker where Tommy will plant the bomb. You only have five seconds, so make a run for it!!! After the coffee shop explodes, you will obtain a 5 star wanted level and the FBI will chase you. Escape to Vercetti Estate where you will lose your wanted level upon entering the mansion.