Party line is a poor indicator of property interests. It is correlated, but not causal. The causal variable is property ownership vs renting. City council me

Party line is a poor indicator of property interests. It is correlated, but not causal. The causal variable is property ownership vs renting. City council members are older (regardless of party membership) will be property owners, and thus because this issue impacts them personally and very directly, they will always vote to increase their property values (ie less construction / less supply). Democratic leaders are still usually older, and thus owners - and since this issue impacts them very very personally, they will vote against their constituency.