In the UK there are lots of government policies/incentives by the Conservative Party to encourage people to buy a home. These policies can be revoked.
H2B/LISA schemes artificially raise house prices above what the floor would otherwise be.
Partly that, but also partly that in a constituency based system, there will be a bias towards those who are in the constituency longer. I have to register to vote every time I move constituencies (a fairly regular event for a renter), while those who buy only register once (and can be considered returning customers for the member of parliament).
Wealth (which is correlated with property ownership) is also correlated with voting.