The SC4 Wiki has a page on Stage Limits and Thresholds. It says:  "These properties determine the percentual chances that buildings of a certain growth stages will appear (depending on the size of your region)."  I'm trying to understand what this means exactly. Here's the residential table from the wiki: Let's look at the bottom line of the table. Let's say I zone a block of low-density residential when at this capacity. There is a 1% chance of a Level 1 house developing? An 8% chance of a Stage 1-3 house developing?