Knowledge is power, they say, and it's as true in commercial lease negotiation as anywhere else. Landlords deal with leases all day long — they have the knowledge. Many tenants are unskilled in what and how to negotiate leases and may be uninformed about the details of their lease, even if it's a renewal. This lack of knowledge can come back to haunt them in numerous ways. Roll up your sleeves and get informed — the decisions you make during lease negotiation can profoundly affect your bottom line. And remember: Everything is negotiable.