As a once landlord, even if government did a great job with it, I don't see why rents wouldn't go up to match it. If my tenants were guaranteed 50k a year, I would instantly raise my rent to 1/3rd that. Other industries would follow. Market rates really just hash out to be whatever the consumer can bear before going bankrupt.
So the government would also need a Communist-level of price controls, which as history has shown us, doesn't actually work.
The welfare system today 'works' because so few are on welfare or fully dependant on welfare, so a more market economy exists with rental pricing. If everyone, or most, are on welfare, then we'll just price against welfare. That means you'll get your UBI check but you'll be living in flophouses and be broke every month for basic things when before you had a nice middle-class house, savings, enjoyable lifestyles, upward mobility, etc.
I have yet to see UBI advocates resolve the inflationary problem short of re-implementing Soviet-style communism, yet they are unable to resolve the various problems with communism the same way the Soviets and others were unable to do so in the past.