You might think that the building you're going to lease is "up to code", or if it's not then it's the landlords problem. Don't be so sure. It's not uncommon for landlords to include a "Compliance with Laws" clause in your lease agreement which can create some real headaches for you.
When negotiating your commercial lease, you are going to want to look into the building compliance terms and ensure you won't be on the hook for any future compliance expenses.
See the following articles for some helpful tips and guidelines.