Thanks. I knew "fire break" didn't sound right. I guess that's in a forest.
The firebreaks do a great job these days in minimizing danger to neighboring units, but some damage to other townhomes is still pretty common from fire, so much so that our new townhome HOA has a specific clause requiring minimums for liability on your homeowner insurance to cover it. Though I assume its not so much fire but gas explosion that could ensue due to fire.