Why would it be ehrlich or mentschlich to expect a landlord not to raise rent to the maximum allowed by law/halacha?
(FTR, I have not been a renter or a landlord in over 20 years)
(1) There is a person (family) on the other side of the transaction, to whom it will cause financial and/or emotional distress
(2) It an essential item (not a luxury or discretionary item)
(3) Not to push a guy/family out of kollel
(4) The tenant is usually in a weaker financial position
And on a less objective front
--Which gadol that you admire would do act that way?
--Do you think behavior would make a Kiddush Hashem?
--Do you think this is part of the histadlus Hashem requires we do to get our allotted portion?
--Would/could stating that the landlord did that be Lashon Hora/could be viewed negatively?
--Would you like specific quotes in pirkei avos? Mishneh beginning "Aizehu derech sheyavor hadam . . kol she tiferes L'oseha"
--Middos tovos at times require we go beyond the absolute requirements of shulchan aruch.
Try to take Hashem's perspective: How would you want your kids to act, if one was the landlord and the other was the tenant?