Why would a multi-tenant industrial or retail property NOT achieve the listed NOI?

[Alex Sarnoff]

Soon purchasing my first commercial property, I am looking at multi-tenant NNN industrial or retail. It seems like other than capex that the landlord is responsible for (typically roof and HVAC) there aren't many reasons why I wouldn't achieve the broker's forcasted NOI.

There are 3% rent increases built into the leases and I can bill the tenants for increased CAM expenses, taxes and insurance.

Am I missing something here? Is there any risk of not achieving the listed NOI other than a tenant moving out? If a tenant leaves I know I will be hit with leasing fees, TI's and vacancy.