I think this is an excellent idea
Alternative Neighborhood District Names: Borough District - Quarter District- Suburb District - Utility District- Community District - Locality District- Service District- Habitation District - Residence District - Settlement District/
Since this is the mutually exclusive building thread (Yes I'm overdoing it, but the more ideas out there the better):
Aqueduct: Mid build cost. +1 Housing, +1 Housing for each adjacent Neighborhood District with an aqueduct. (An aqueduct graphic connecting the districts would be neat). Maintenance 2.
Apothecary: Mid build cost. +1 Housing, +1 Science, +1 Culture. Maintenance 2
Baths: Mid build cost. +1 Housing, +1 Amenity. Maintenance 2. Tile must have fresh water to build.
Well: Low build cost. +1 Housing. Maintenance 1
Cesspit: Low build cost. +1 Housing, -1 Amenity. Maintenance 0
Hospital: Mid build cost. +2 Housing. Maintenance 2
Orphanage: Mid build cost. +1 Housing per eight citizens in city. Maintenance 2
Sanatorium: Mid build cost. +1 Housing. Additional +1 Housing, +1 Amenity if Desert Tile. Maintenance 2.
Sewers: High build cost. +3 Housing. Maintenance 3
Waterworks: High build cost. +1 Housing. Additional +1 Housing, +1 Amenities if tile has fresh water. Maintenance 3.
Health Spa: Mid build cost. +1 Housing, Tourism generated; the exact amount is twice the Appeal of the tile on which the Health Spa was built (same as seaside resort). Tile must be adjacent to mountain.
Water Treatment Plant: High build cost. +3 Housing. Maintenance 4.
Desalinization Plant: Very High build cost. +5 Housing. Maintenance 6. Tile must be adjacent to Coast.