Whether you are an owner of the property or you are a tenant, if you are facing commercial lease dispute then the best way to deal with it is by hiring an experienced lawyer. You need to find a good law firm which can help you with your concern with reasonable fees.
There is no need to take any steps unless you are sure what you are doing and it is better if you leave it to professionals as they deal with these kinds of situations on regular basis and they know which decision is in your best interest. If you are owner then you should explain everything about the breach of the contract to your lawyer.
If you are tenant and you are accused of breaching the contract then also every detail should be explained to your lawyers. In matter of properties, it is better if you make quick decisions; more delay may increases troubles for you.
Apart from this, if you have any troubles related with your property then you can approach a god property solicitor for best advice. You should follow their valuable suggestions for best outcome. So when you are in any kind of dispute related with your property, hire the best lawyer in town.