How do you treat tenant improvements?

[Carl W.]

I gave my tenant permission to make an improvement to the building. I didn't think anything of it because it seemed like a minor request at the time. I saw the improvement the other evening and I was very happy with the results and installation. I like it so much I'm thinking I should reimburse the tenant for the cost. This is my first time dealing with a tenant improvement and I'd like to know how other landlords handle it. I never thought to improve the building in this way since it does not benefit me at all. It was strictly done for their benefit. Thanks!