Signing a commercial lease as a business owner should not be taken lightly. A business owners' biggest expense may be a store-front or office space when they are first starting out. Like any contract, it may be too late to make any changes to a commercial lease once you've signed it. A commercial lease is a legal, binding document that may prevent you from growing your business - or worse, run it into the ground. Here are four simple things to consider before signing your commercial lease.