How to Add a Fee for Parking

[Blair C.]

I was seeking advice regarding add-on fees at a rental property.  I have a duplex and recently remodeled (read salvaged) the detached garage to make it as good as new.  Prior to these repairs the garage was not safe and a huge eye sore.  I am now considering allowing the tenant to use the garage for parking.  I was going to introduce a small monthly fee for this new benefit at the property.  I was curious if any other landlords had added fees during an active lease and what would be the best way to set this up without seeming to nickel and dime the tenant.  Thank you for any advice you can offer.

BC