Your landlord is flowed to increase the rent by any amount as long as the increase is not for an illegal reason.

A. 只要不是出于非法原因，允许房东提高租金，数额不限。

B. 只要经过协商，房东可以在和你签订新租约时提高租金。

C. 只要出于合理的原因，房东就可以增加一定数额的租金。