Creative reasons for lowering rent

[Victor Quan]

One of my best friends posed a question to me that I couldn't quite answer.  He's a renter and he asked me the following:

Are there any creative ways to lower rent?  

I'm a landlord myself and offered my own experience but I was curious if any renters or landlords have come across instances in which they have experienced the act of receiving or lowering their rent/cashflow.