Link output is not limited to displaying a flat link list of cities or subdivisions or zip codes. They can be combined using the group_by parameter to generate more interesting output:

Possible group_by combinations are:
- group_by="city,prop_type"
- group_by="city,area"
- group_by="city,subdivision"
- group_by="area,prop_type"
- group_by="subdivision,prop_type"
- group_by="zip,prop_type"