To do what? People want to live near three sorts of things:
Social connections like family / friends / potential mates
Livelihood needs like education / jobs / foods (1st world, the food they like is fresh / better; historic / other food exists!)
General QoL climate / beauty / recreational opportunities
Many big cities cost more because it's where the opportunity is, or where their family that previously/currently prospered from that opportunity resides. For many of us on HN it's where the sort of jobs we'd be good at contributing to society exist. Even if some corp opened an office in the middle of Montana there wouldn't be anything else there as other opportunities. Heck given UBI, I'd rather join Star Fleet with awesome healthcare for all, cool technical challenges, and anything other than Starbase 80.
In the same basic econ 101, you learn that real estate demand is localized. UBI allows folks to move to middle of nowhere Montana.