That zoning change might raise local prices a lot. Neighbours may believe their own property will appreciate in value massively, and approve the zoning change

That zoning change might raise local prices a lot. Neighbours may believe their own property will appreciate in value massively, and approve the zoning change just for that reason, especially if it's advertised that way to them. Never underestimate the ability of people to ignore everything else, when property price increases are at the forefront of their minds.