Referral for finding a client a rental??

[Cody Steck]

I have a client who is in a bit of a crunch - They were in a lease option and it has fallen apart. They are looking for another lease option or they need to get into a rental for ~6 months. If I help them find a rental, how do I go about asking for a referral from the landlord?

I've never done this so I don't want to waste my time working with them for free, I'm just not sure how to structure it.