| Graphic | City Improvement | Requires | Effect |
 |
Airport
Cost: 160 |
Flight | Produces veteran air units, trading hub |
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Aqueduct
Cost: 100 Upkeep: 1 |
Construction | Allows population growth past size 6, for cities with no access to fresh water |
 |
Bank
Cost: 160 |
Banking | 50% increase to the city’s tax revenue |
 |
Barracks
Cost: 40 Upkeep: 1 |
— |
Produces veteran ground units, allows ground unit upgrade, and heals ground units in 1 turn |
 |
Cathedral
Cost: 160 |
Monotheism | Requires temple, makes 3 unhappy citizens content |
 |
City Walls
Cost: 20 Upkeep: 0 |
Masonry |
Provides a land bombardment defense of 8, and +50% to defensive bonus against land attacks, not needed past size 6 |
 |
Coal Plant
Cost: 160 |
Industrialization, Coal | Increases factory output by 50%, causes pollution |
 |
Coastal Fortress
Cost: 40 Upkeep: 0 |
Metallurgy, Iron, Saltpeter | Provides a naval bombardment defense of 8, +50% against naval attacks, and automatically bombards passing enemy ships |
 |
Colosseum
Cost: 120 |
Construction | Makes 2 unhappy citizens content |
 |
Courthouse
Cost: 80 Upkeep: 1 |
Code of Laws | Reduces corruption, reduces effect of propaganda against the city |
 |
Factory
Cost: 240 |
Industrialization, Iron | 50% increase to production, causes pollution |
 |
Granary
Cost: 60 upkeep: 1 |
Pottery | Halves food storage required for population growth |
 |
Harbor
Cost: 80 |
Map Making | +1 food from coast, sea and ocean squares, produces veteran sea units, trading hub, and upgrades sea units |
 |
Hospital
Cost: 160 Upkeep: 2 |
Sanitation | Allows population growth past size 12 |
 |
Hydro Plant
Cost: 240 |
Electronics | Increases factory output by 50%, requires a river, makes no pollution |
 |
Library
Cost: 80 Upkeep: 1 |
Literature | 50% increase to the city’s science output |
 |
Manufacturing Plant
Cost: 320 |
Robotics |
50% increase to production, causes pollution |
 |
Marketplace
Cost: 100 Upkeep: 1 |
Currency | 50% increase to tax revenue, increases effect of luxury resources |
 |
Mass Transit
Cost: 200 |
Ecology, Rubber | Reduces pollution from population |
 |
Nuclear Plant
Cost: 240 Upkeep: 3 |
Nuclear Power, Uranium | Increases factory output by 100%, produces no pollution, requires fresh water, chance of meltdown |
 |
Offshore Platform
Cost: 240 |
Miniaturization | +1 shield from coast, sea and ocean squares |
 |
Palace
Cost: 100 Upkeep: 0 |
Masonry | Acts as center of your empire, eliminates corruption/waste in the capital and reduces it in nearby cities |
 |
Police Station
Cost: 160 |
Communism | Reduces war weariness, reduces corruption |
 |
Recycling Plant
Cost: 200 Upkeep: 2 |
Recycling | Reduces pollution caused by city improvements |
 |
Research Lab
Cost: 200 |
Computers | 50% increase to science output |
 |
SAM Missile Battery
Cost: 80 Upkeep: 2 |
Rocketry, Aluminum | Defends against air bombardment |
 |
Solar Plant
Cost: 320 |
Ecology | Increases factory output by 50%, makes no pollution |
 |
Temple
Cost: 60 Upkeep: 1 |
Ceremonial Burial | Makes 1 unhappy citizen content |
 |
University
Cost: 200 |
Education | 50% increase to science output |
Related Links:
- Info about city management are available in the Civilization III Info Center.