Those seem incompatible to me.
(UBI means Universal Basic Income, giving everyone a basic income, for free)
Cartel is the word you are probably looking for. Cartels are when an association of different suppliers collude to restrict competition and keep prices high.
it’s only really a cartel if they get together and make these plans, in reality none of these landlords are stupid, they will just adjust their demands to the upper region of what people feel acceptable, this slowly moves the “acceptability window” up, all without anyone needing to conspire with anyone else