receiving a rent from a location that I also rent.

I do rent a warehouse for my business, about 45 thousand square feet; my rent is about $45,000.00.  but from this space I do rent to somebody else and receive $3,000.00. The question is,

how can I book the $3,000.00, should I credit rent expense or another income account.

Appreciate your advice.

Thank you

Joe Caal