Where I live, the easiest and best place to fortify would be the local middle school. it's less than 2 miles away from my home and is close to many things in town. it is more or less square shaped. to fortify it, all that is neccesary is a few things. the stairs leading up to the 2nd floor usually have a classroom parralel to them. i would, either smashing or using small explosives, detonate those walls to give a firing position on the stairs. there are 4 sets of stairs as well as an elevator for handicapped people and ladders to get down from the roof access points.
