UBI is implemented tomorrow. Every citizen gets $1000 per month.
Landlord now knows you have an extra $1000 that you never had before.
Why wouldn't the landlord raise prices?
Now you have an extra $1000 a month and instead of eating rice and beans for a few meals you go out to a restaurant. The restaurant owners know everyone is eating out more so why not raise prices and maximize shareholder profit as always. The restaurant/corporation is on TV saying, "well, demand increased and it is a simple Economic principle that prices had to increase. There's nothing we can do about it".
Your state/country has toll roads. The state needs money for its deficit.
UBI is implemented and the state/country sees it as the perfect time to incrementally raise toll prices.
Next thing you know UBI is effectively gone because everything costs more and billionaires keep hitting higher and higher all time net worth records.
The fact that the landlord is also getting an extra 1000 a month means they'll be less incentivised to put up the price. Also market forces, it'd just take a couple of landlords to have some morals, or prioritise having their properties filled to keep prices down.
With the restaurant example market forces again. If the shitty big chain restaurant put up their prices and the nice local restaurant didn't then suddenly they'll see more people going to them. It would also make it really easy for shitty chain B to undercut shitty chain A.
Then you also have the backup of government regulations and using tax systems to make it not viable to price gouge that way.