If a fire happened today and you didn't have renters insurance you would be stuck paying for damages to the building as well as trying to replace everything you own. (rentersinsurance.net)
Your landlord is only responsible for covering damage to the building. (rentersinsurance.net)
However, these policies do not provide coverage for damage that occurs within your unit, even if it is the direct result of damage to the building's structure. (trustedchoice.com)