When designing external lightning protection of the building, we have to consider the structures surrounding it. All facilities, if they are higher than the protected one, will be natural lightning arresters relative to it. In some cases, the installation of artificial lightning rods may not be required at all.
We can determine several approaches when calculating the lightning protection using natural lightning arresters. They will differ in the relationship between the heights of the protected building and facilities around it. Read more about these approaches in Should We Consider Adjacent Buildings When Calculating Lightning Protection?. After reading the first part of the article, read the section "What About Internal Lightning Protection?". For some of you, it may be the most important.