Grand Theft Auto IV Walkthrough

Now, you can use grenades from behind your original cover, but it's dangerous because Niko loves throwing underhand if you don't arc your throw high enough. So, break out your RPG and make your first order of business three well-placed shots to the cars your foes are using to defend themselves. Not only will that eliminate those pieces of cover and set them ablaze, but it will certainly create collateral damage as well. Then, begin firing away, preferably with an assault rifle, as you work your way forward into the fray. Because there will be so much commotion here, your best bet is to use your sense of hearing to try and learn where enemy fire is coming from. Then, devote your attention (with some well-used auto-aiming) to that area and extinguish the threat. When all of the enemies here are eliminated, be sure to comb the area for dropped weaponry. If you went to the weapon shop, you're probably fine, but hey, you never know.

Now, you can go through a door on the destroyed building's main level, which will let you access the building just fine. But if you're patient, you can actually go around to the back of the building, where a ladder will lead up to the roof. From here, you can shoot at stray enemies through holes in the roof, and then jump through one of the holes, landing on the ground below. Once you get up, immediately arm yourself, run for nearby cover, and begin killing the rest of the enemies in the building. Compared to the fray you found yourself in outside, this shouldn't challenge you too much, but make sure all enemies are killed before heading into the far end of the building, where you'll find Dimitri and Pegorino.

Seems to be that with almost any relationship Dimitri manages to forge, they don't last very long. When you run in on the two men, Dimitri has a pistol to Jimmy's head, and before your very eyes, he does him in. There's no time to worry about that, however (Jimmy was a rat, anyway). Instead, once Dimitri runs off, run up the stairs after him. You'll come out outside and will have to deal with about five more of his men lining the roof (this is the same area the ladder led up to, though the door was sealed if you tried to go into it earlier). As you pursue Dimitri over the roof, be absolutely positive you've killed all of the enemies in your way. There are few things in the game more damaging than an assault rifle round to the back.