The challenge here is that generally, rents are rising nationwide. If your landlord is an individual, you might have some luck with "we are taking great care of your house and paying on time or early every month," if both of those things are true.
The best way to do it is find some similar, cheaper, comparable options and present them to your landlord. Tell them you're willing to move (and mean it) if they can't match the price. If you aren't willing to switch, then don't expect much movement. If you can't find any cheaper comparable units, then you really don't have much leverage, so you just have to hope that you get lucky and ask while they're in a good mood!
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