I’ve soured on it recently, if you gave everyone $1000 a month then your landlord is just going to raise your rent by $1000.

UBI empowers tenants and alternate living situations.

1. Every neighbourhood is instantly gentrified. That can be higher rents, but its good for shopping deserts and no crime.
2. You have "move out" money if the landlord is an asshole.
3. Renting rooms to people is lower risk because you know they can pay.
4. Home ownership, is more bankable because you have income security independent of your job. Again, subleting/renting parts of home is easier if you lose your job.
5. You can move to brand new area, including lower cost "ghost town" areas without having a job lined up first.
6. If you don't want to work, you don't really need to be living in high cost city. Smaller/cheaper towns look fine.

Sure people will want nicer places to live, but there's more options than renting with UBI, and other power dynamics that permit tenants to escape due to other options.