By selecting the best weapon prior to mounting the on-foot attack of the Martinez Building after the chopper assault, I found it much easier this time around. The Spaz shotgun is most excellent when many baddies are in close range as it takes them all out at once.
After that, I had to shoot down another helicopter, and finally there was a three-way showdown on the roof – the remaining Mendez brother, Martinez, and me. And it was easy, they died, and I won. Hurrahs!
After the credits, I spent a while taking over businesses, but that got dull in the end. I’ve got about 85% of them or something though now.