What, five and ten acre zoning? It's a type of zoning district that only allows one house on each 5 or 10 acre parcel, respectively. If you want country roads lined with million dollar "rustic modern" post and beam houses (you know, the ones built to look like old farmhouses connected to a barn, so they put red siding on the attached three car garage) and that are owned by people from other states, it's the best way to do it. By setting the acreage requirements so high, it eliminates entry level houses, because the lots themselves go for $150,000 before you've broken ground for a foundation.

It's also really inefficient from a tax perspective. First, because the houses are fewer and further between, there is a smaller tax base, even though individual houses are more valuable. Second, even while 5 and 10 acre zoned houses are highly dispersed, their owners still need municipal services, which take more effort to provide and are therefore more expensive.

There's also the Current Use program to discuss, which is its own huge problem for affordability. But you asked about zoning.